All severe depressions or anxiety states must be clinically recognized and treated appropriately (8). However, at least one major school of thought insists that to achieve the optimal impact of any intervention, the clinician and researcher must also seek to determine whether there are important subgroups of individuals with similar mood or affective clinical pictures (9). The goal is to identify additional characteristics that indicate that the prognoses and treatments for some anxiety or depressive states might be substantially different from one another (5, 8). For example, depressive syndromes that are observed only in the context of some medical conditions (e.g., thyroid disorders) or drug treatments (e.g., antihypertensive therapy) require all of the emergency steps relevant for any severe depression. However, the prognoses for these "organic" mood disorders include a high likelihood that the affective symptoms will disappear with time alone after appropriate treatment of the hormonal condition or an adjustment of the blood pressure medication (10). Similarly, as has been discussed elsewhere, major depressive episodes observed only in the context of intoxication or withdrawal from substances of abuse are likely to clear spontaneously over time following abstinence, and there is little indication that they routinely require antidepressant medications (5, 11).
eneral factors that complicate data interpretation">
Several overarching factors complicate the interpretation of the data accumulated to date regarding the relationship between anxiety symptoms and alcohol use disorders. First, documenting symptoms is not equivalent to establishing a diagnosis. A number of studies have shown that the correspondence between cases identified by means of a symptom checklist and a clinical diagnosis is far from perfect. In fact, in one study the sensitivity of these measures for identifying a DSM-III-R lifetime diagnosis of depression was less than 75%, and the specificity was less than 55% (1). Similarly, the specificity of the Michigan Alcohol Screening Test (MAST) (14) for identifying cases of true alcoholism may be as low as 36% (15). Differences in symptoms surveyed, determining whether symptoms cluster, and assessing the severity of the symptoms are likely causes of the discrepancy between cases identified by a symptom checklist and those receiving a clinical diagnosis.
In this context, acute or protracted withdrawal from alcohol is characterized by a high rate of anxiety symptoms (16—19). In several studies 80% of alcohol-dependent men admitted to ever having repetitive panic attacks in the course of withdrawal from alcohol, and 50%—67% of the alcohol-dependent men had high scores on state anxiety measures, with symptoms that resembled generalized anxiety disorder and social phobia (16). If seen only in the context of withdrawal, these and other symptoms are likely to disappear with time (20—29). Thus, when phobic, panic-like, or other anxiety pictures are observed during acute or protracted withdrawal, it is difficult to determine from a cross-sectional evaluation whether the individual has a major anxiety disorder, with the implied lifelong course of anxiety symptoms (30), or whether these symptoms are likely to disappear with time.
A related issue involves differences between studies in the criteria used for "alcoholism." Some authors discuss alcohol-related "problems," others focus on alcohol abuse, and still others consider dependence. In addition, the criteria for alcoholism, alcohol abuse, and alcohol dependence have changed over the last few decades (9, 10, 15).
A second factor that jeopardizes interpretation of the rates of anxiety disorders among alcoholics is assortative mating (31). Most individuals do not select a mate by chance alone; rather, they tend to choose someone on the basis of their physical characteristics, ethnic background, etc. (32). An important factor in mate selection appears to be the probability that an individual with a major behavioral or psychiatric syndrome is more likely than others from the population to select a mate with problems. In one study (33) two-thirds of individuals with a major depressive disorder selected a spouse with a psychiatric syndrome, while other publications suggest that alcohol-dependent individuals are likelier than average to select a spouse with alcohol, drug, severe antisocial, or psychiatric problems (34—37). Additional studies indicate that alcohol-dependent individuals with major depression or other psychiatric syndromes are more likely than nondepressed alcoholics to have a parent with that second disorder (5, 38, 39). Once assortative mating is considered, the rate of anxiety disorders in relatives of alcoholics decreases by about 10% (40). Thus, the finding of a bona fide major anxiety disorder among alcohol-dependent individuals could be the result of a family history of major anxiety disorders independent of their own drinking problems.
A third complication occurs when subjects are asked for their opinion about whether the alcohol or anxiety syndrome came first. Such queries usually involve the unstructured solicitation of opinions from subjects; few studies have required careful documentation of data and generation of information from additional informants. A number of investigators have reported that when alcohol and anxiety disorders are seen in the same individual, 40%—60% of subjects indicate that the anxiety disorder appeared first (1, 41—44). However, when more vigorous approaches are used, subjective opinions are likely to be found to be inaccurate. Stockwell and Bolderston (20) pointed out that the subject is likely to name the first symptom of nervousness he or she ever experienced, not a full-blown diagnosable disorder. At least two groups of investigators (45, 46) have followed up on self-reports by gathering data from additional informants or reviewing earlier case records. Those studies showed that for two-thirds of the patients who felt that the alcohol problems developed later than the behavioral condition, there was evidence of severe alcohol-related life problems before other diagnosable anxiety syndromes were observed. This finding is also supported by a 40-year follow-up of college freshmen that revealed no evidence of antecedent anxiety disorders in alcoholics (47, 48), by evaluations of anxiety in identical twins of alcoholics that revealed anxiety disorders only subsequent to alcoholism (49), and by a prospective evaluation of a general community sample (21). Thus, even though in some investigations efforts were made to determine whether the anxiety syndromes appeared independently of the heavy drinking, more vigorous studies indicate that in at least two-thirds of the individuals who seem to have both psychiatric and alcohol-related disorders, it is the alcohol-related syndromes that appeared first.
Fourth, few studies of the relationship between alcohol and anxiety disorders controlled for the possibility that both the alcohol and anxiety conditions might be related to a third diagnosis, such as another drug dependence syndrome, especially one involving stimulants. Comorbid drug use and associated disorders can be seen in many alcohol-dependent men and women and are observed at high rates among people with antisocial personality disorder, two-thirds of whom develop severe life problems with both alcohol and drugs (50, 51). The subsequent intoxication with stimulant drugs, such as amphetamines and cocaine, can cause intense feelings of anxiety, panic attacks, phobic-type behavior, and even obsessional behavior (10). Thus, even documentation that an alcohol-dependent individual at some point in his or her life demonstrated panic attacks severe enough to fulfill criteria for panic disorder tells the researcher and clinician little about the probable future course and optimal long-term treatment if these anxiety symptoms were observed only in the context of severe intoxication with stimulants. The same is true for almost any anxiety syndrome seen in this context.
Of course, additional factors can affect the levels of anxiety symptoms observed in alcohol-dependent individuals. Most men and women come to treatment in the context of severe life problems, conditions that can themselves add to symptoms of anxiety. In addition, many alcohol-dependent men and women have grown up in homes that lack a stable environment, often reflecting the impairments that accompany alcohol use disorders, drug use disorders, and antisocial personality disorder, which are frequently seen in the parents of alcohol-dependent individuals (52). This level of life stress and problems with adjustment to difficulties during early periods of development can themselves add severe anxiety symptoms that might not represent independent anxiety disorders (53, 54). Also, many of these alcoholic subjects might be demonstrating anxiety symptoms that relate to organic deficits, including a fetal alcohol effect (55). Finally, because of the demanding nature of work on comorbid syndromes, many of the studies involved a limited number of subjects. Unfortunately, small sample sizes have relatively low statistical power for detecting true relationships between variables. Estimates obtained from small samples are typically unreliable since they may either under- or overestimate the magnitude of the true relationship.
These considerations do not prove that alcohol-dependent men and women lack a high risk for lifelong anxiety syndromes. Nor do these complicating factors indicate that the clinician should ignore anxiety syndromes when they occur. All such patients require careful evaluations and reassurance, and many can benefit from behavioral interventions that can decrease the intensity of symptoms. However, the complications noted here make it difficult 1) to draw definitive conclusions regarding whether alcohol-dependent men and women are more likely than the general population to demonstrate severe major anxiety syndromes requiring long-term treatment and 2) to determine whether alcohol and anxiety disorders are linked.
Recognizing the problems in interpreting the literature without carefully evaluating the methods involved, we examined six types of data related to the relationship between alcohol dependence and major anxiety disorders. Even after these evaluations, methodological problems remain that jeopardize conclusions. These remaining caveats include an absence of appropriate comparison subjects and imprecise and changing definitions of alcoholism and anxiety syndromes. However, the studies are clear enough to raise the question of whether there is a close relationship between alcoholism and lifelong anxiety disorders in the majority of patients.
The methods used in this critical review of the literature began with a MEDLINE search of all English-language articles published in refereed journals since 1975 and presenting original data on the relationship between alcoholism and major anxiety disorders. All such articles were reviewed and formed the basis for the information presented here.
We approached the data in several ways. First, we critically reviewed the existing literature on the rate of anxiety disorders among alcohol-dependent individuals, considering as many of the methodological complexities outlined in the preceding section as possible. The adjusted rates were based on the proportion of subjects reported to have an anxiety syndrome that developed before the alcoholism. In the absence of such estimates within the study, an overall estimate was used, as will be explained. Then the overall mean rate was developed by determining the number of subjects in each study likely to have had an anxiety syndrome independent of alcoholism; these numbers were added across all studies, and that number was divided by the total number of subjects. When an adjusted rate involved a range, the average rate was used. For example, for a range of 10% to 20% the overall adjusted figure of 15% was used in computing the overall mean.
In the second type of evaluation, in an effort to overcome many of the caveats outlined in the preceding section, the rate of anxiety disorders in children of alcohol-dependent individuals was analyzed. This evaluation was based on the premise that if alcohol dependence and anxiety disorders are closely tied together, the children of alcohol-dependent parents, themselves at high risk for the future development of alcoholism, should demonstrate a high rate of anxiety disorders. Third, prospective studies of alcohol-dependent individuals were evaluated for evidence of the development of a major anxiety disorder subsequent to the achievement of abstinence. Fourth, the rate of alcoholism among patients with anxiety disorders was determined. Fifth, the familial crossover between anxiety disorders and alcoholism was assessed. Finally, data from prospective studies in the general population were critically evaluated to determine whether there is evidence of a higher than normal risk for anxiety disorders in individuals who later go on to develop alcoholism.
Anxiety disorders among alcohol-dependent individuals
The prominent articles in the literature dealing with the rate of anxiety disorders in alcoholic individuals are outlined in tables 1T1—5T5. In each table the third column contains the period of abstinence that preceded the evaluation of the subject. This information is important since high levels of anxiety and potential misdiagnoses of lifelong anxiety disorders are likely to occur during the first 2 weeks of abstinence because of the acute withdrawal or abstinence syndrome (66). These symptoms are likely to continue at a decreasing level of intensity over the subsequent months as part of protracted withdrawal (17). Unfortunately, as would be true in any critical literature review, there are differences in the criteria used for alcohol and anxiety disorders and most reports do not give separate figures for men and women. Also, few of these studies used a time line to indicate the actual development of diagnosable syndromes, and almost none incorporated information taken from a resource person. Thus, the results of these evaluations are not definitive, but trends can be observed.
The final column in each table offers a gross adjusted rate for anxiety disorder, usually relating to lifetime diagnoses, that might begin to exclude temporary organic conditions. This is also a rough estimate since so few studies controlled for the complicating factors we have outlined. Regarding the final column, if the authors themselves indicated the proportion of anxiety disorders that might have developed before the alcohol dependence/abuse, a prerequisite for having caused the substance use disorder, this number was multiplied by the rate of illness reported, to give an adjusted rate. It is important to remember that for the reasons already described, this is likely to be a substantial overestimate of the proportion of individuals who truly had anxiety disorders independent of their heavy drinking (20). When the authors did not estimate the rate of independent anxiety syndromes, an adjusted range of rates between 25% and 50% for independent disorders was selected on the basis of the overall average of estimated independent syndromes. The last row of each table offers the total number of subjects involved across all studies and the mean adjusted rate of anxiety disorder. A footnote to each table contains estimated lifetime rates for the relevant disorder in the general population from a series of reports (4, 7, 61—63).
The optimal table would offer data separately by gender and would indicate the level of methodological rigor involved in each study. Unfortunately, this would have made the tables so complex that interpretation would have been difficult. Thus, the reader is urged to return to specific references to estimate the level of confidence one can have in the results.
Table 1T1 summarizes 10 studies in which the rate of panic disorder (or at least repetitive panic attacks) among alcoholics was evaluated. Unfortunately, as is true of the studies in all the tables, various definitions of panic and alcohol-related disorders were used in different studies. The unadjusted rates for panic conditions ranged from 3% to 60%, and the adjusted figures ranged from 2% to 17%. The adjusted figures do not take into account the confounding factors we have described. The adjusted, but still exaggerated, rates can be summarized as a mean of 6%, a figure that is somewhat higher than the general population lifetime rate for panic disorder but considerably lower than the estimates based on the raw data alone.
Table 2T2 outlines seven studies, incorporating 786 subjects, regarding the potential rate of agoraphobia among alcoholics. The unadjusted rates were 2%—41%, and the grossly adjusted rates were 1%—21%. These translate to an overall mean of 9%, a rate that is a bit higher than that in the general population (5% to 6% overall). Table 3T3, relating to obsessive-compulsive disorder, displays adjusted rates from 2% to 6%, with an overall mean similar to general population rates. Table 4T4 summarizes reports in the literature of social phobia among alcoholics; the grossly adjusted rates range from 1% to 20% (mean=9%). While higher than several of the general population rates reported, these figures are still inflated by all of the uncontrolled factors we have listed. Table 5T5 relates to generalized anxiety disorder. While the overall mean is skewed by the large number of people in one study, the median of 9% (the middle of the rates across studies) is similar to general population rates.
While this is a critical review of the literature and not a meta-analysis, the studies reflected in tables 1T1—5T5 indicate the possibility that, after additional factors are controlled for as much as possible, alcoholics report rates of panic disorder and perhaps generalized anxiety disorder and social phobia that are higher than the rates for the general population, although the rates of other anxiety disorders do not appear to be higher than normal. However, even here, the adjusted (but still potentially inflated) rates for other anxiety disorders are only slightly in excess of those found in the general population. More studies using more rigorous approaches for diagnoses and incorporating appropriate comparison subjects are needed.
Anxiety disorders among children of alcoholics
Alcoholism is a genetically influenced disorder, and the risk for severe repetitive problems with alcohol (i.e., alcohol abuse or dependence) has been found to be three to four times as high in the offspring of alcoholics as in appropriate comparison subjects (52, 67, 68). Although the age at first drink is likely to be in the early to mid-teens (similar to that for the general population), major alcohol problems often do not appear until the 20s or 30s for most people with primary alcohol dependence (69). On the other hand, the age at onset for most major anxiety disorders is before age 30 (30). Therefore, if individuals at high risk for alcoholism were likely to develop their alcohol abuse or dependence as a complication of preexisting anxiety disorders or if anxiety and alcohol-related disorders were genetically associated or linked, one would expect that the offspring of alcoholics would have higher than normal rates of anxiety disorders before the onset of alcohol dependence.
There are data indicating that children of alcohol-dependent men and women show high rates of a variety of symptoms during childhood (70—73). These data, frequently including children of parents with drug dependence and/or antisocial personality disorder, document high levels of impulsiveness and low self-concept among children of these groups (35, 54, 74—76). Such studies also suggest a higher than normal prevalence of conduct disorder, oppositional disorder, and/or attention deficit disorder in children of alcoholics. However, once the impact of antisocial personality disorder is controlled, this finding regarding attention deficit disorder might no longer hold (77—82).
Despite the findings of a high level of anxiety symptoms in some, but not all, studies of children of alcoholics, few prospective studies have demonstrated that these offspring have a higher than expected rate of diagnosable anxiety disorders. For example, an evaluation of adolescents from families with alcoholism in multiple generations indicated that the rates of diagnosable anxiety disorders were no higher than those for comparison subjects (35). Similarly, a campus survey of 18—21-year-old sons of alcoholics and comparison subjects demonstrated no difference in risk for any major psychiatric syndromes between groups (83). Also, a recently completed 10-year follow-up of sons of alcoholics and men with negative family histories who were originally evaluated at about age 20 revealed no greater risk for any major anxiety disorder in the individuals at higher risk for the future development of alcoholism (84). Further, support for the conclusion that a family history of alcoholism does not increase the risk for anxiety disorders comes from an evaluation of young children of alcoholics and comparison subjects at age 3 (85). A study of identical twins of alcoholics revealed that their risk for anxiety symptoms is no higher than normal except in the context of heavy drinking (49). The series of studies of children of alcoholics and comparison subjects from a Danish population, identifying children soon after birth and following them into their 30s, did not indicate a higher than expected risk for anxiety disorders independent of alcoholism in the children of alcoholics, despite their demonstrated higher prevalence of alcohol use disorders at follow-up (86, 87). Although a slightly higher rate of anxiety diagnoses was seen in the children of alcoholics than in the comparison subjects (13% versus 5%) at age 30, such diagnoses were primarily seen among subjects with active alcohol dependence. Of this group, 41% met criteria for antisocial personality disorder and many had abused drugs other than alcohol (86). This same group did not have higher rates of anxiety disorders at age 20, raising the possibility that the anxiety symptoms observed a decade later may have resulted from temporary organic anxiety syndromes. Finally, a recent evaluation of psychopathology in 125 children of alcoholics and comparison subjects at age 6 to 18 years failed to reveal high rates of any psychiatric diagnoses except oppositional and conduct disorders in the children of alcoholics (73).
On the other hand, one recent cross-sectional study of adults with "alcoholic parents" showed high lifetime risks, relative to those for comparison subjects, of generalized anxiety disorder (15% versus 8%), panic disorder (3% versus 1%), simple phobia (15% versus 11%), and agoraphobia (9% versus 5%) but no difference in the rate of social phobia (88). These results are potentially important and need replication with additional, older populations. However, this study, which grew out of the Epidemiological Catchment Area program, suffers from most of the problems we listed earlier in this paper. The impact of comorbid conditions (e.g., substance use disorders) was not controlled; all anxiety syndromes were counted, including those that might be present in the context of substance use; multiple diagnoses were included with no hierarchy, so that the same person was counted for multiple anxiety syndromes, resulting in potentially inflated rates for some disorders; and family history data were not considered.
Thus, while some psychiatric symptoms occur at higher than expected rates in children of alcoholics, especially adult children of alcoholics who seek help (74, 89), all but one of the studies cited offer little support for a high risk of major diagnosable anxiety disorders among a more representative cross section of offspring of alcoholic parents. This is true in most cross-sectional and longitudinal studies of children of alcoholics from Scandinavia and the United States and even among children of alcoholics who later developed alcohol dependence themselves. However, four of the seven studies included evaluated people before age 21, and additional work will be needed to follow these groups into middle age before more definite conclusions can be drawn.
Follow-up of alcoholics after abstinence
The rates of anxiety disorders among alcoholics described in the section "Anxiety Disorders Among Alcohol-Dependent Individuals" were difficult to interpret because of the impact of acute and protracted withdrawal syndromes (17, 64). Acute withdrawal symptoms, including heightened feelings of anxiety, panic attacks, and phobic behaviors, are most likely to appear during the first week of abstinence. Symptoms of autonomic overactivity and anxiety as part of a protracted withdrawal syndrome are likely to be most intense over the first few weeks to months, and they then decrease in intensity (17—19). Thus, a more accurate reflection of an association between anxiety disorders and alcoholism might accrue from longer-term prospective evaluations of alcohol-dependent individuals.
Our own group recently completed a 1-year follow-up of 239 men with primary alcohol depen-dence (12, 16, 90). The 1-year follow-up included structured diagnostic interviews, focusing on diagnosable DSM-III-R psychiatric syndromes since discharge, administered separately to the subject and to a knowledgeable resource person. This study indicated a higher than expected rate of anxiety symptoms (not diagnosable disorders) among alcoholics who subsequently returned to heavy drinking, but it did not show a high rate of anxiety disorders in subjects who remained abstinent.
Consistent with these findings are the results of several other longitudinal evaluations of alcoholics. Even in the context of high levels of anxiety or affective symptoms soon after the beginning of treatment, these symptoms continued to improve if abstinence was maintained (24—29). However, the paucity of such longitudinal studies mandates that more investigations of this type be carried out before final conclusions are drawn.
Alcoholism among subjects with anxiety disorders
If anxiety disorders and alcoholism are causally related, there should be a high rate of alcoholism among patients being treated for anxiety disorders. Two older studies (91, 92) of the prevalence of alcoholism in patients being treated for anxiety neurosis were identified. These investigations suggest a lifetime population prevalence of alcohol abuse/dependence of approximately 14%. Even though the studies by Torgersen (91) and by Cloninger et al. (92) used different methods for determining the level of alcohol problems, the rates of alcoholism observed in the anxiety disorder patients were consistent with the population prevalence estimates (2, 7, 62).
Five studies (92—96) examined the frequency of alcoholism in panic disorder patients. Most studies showed a rate of alcoholism similar to that found in the general population, approximately 14%—16%. The exception is the study by Reich and Chaudry (93), who found that 17 (28%) of 61 panic disorder patients in a drug treatment study were retrospectively found to have a lifetime history of alcoholism. These subjects were recruited through newspaper advertisements to participate in a study of the effectiveness of alprazolam for panic symptoms. This apparent excess of alcoholism in panic disorder patients might be accurate for this study group. However, these patients with comorbid disorders might have been attracted to a study that offered relief from their panic symptoms. Often persons with substance use disorders do not come to treatment because of the substance abuse problem alone; they seek relief from its associated temporary features, such as depression or anxiety.
Data on the rate of alcoholism in social phobia patients can be found in two reports (96, 97). Both seem to suggest that alcoholism is highly prevalent among patients with social phobia (i.e., 20%—30%). However, in the Amies et al. study (97) alcoholism was defined as occurring when alcohol was "taken in excess," while in the Thyer et al. study (96) alcoholism was defined as a MAST score higher than 5. As indicated previously, the specificity of the MAST for determining alcohol dependence is low. Thus, the rates of alcoholism in these two studies may have been overestimated.
The prevalence of alcoholism among agoraphobic patients has also been examined. Studies by Amies et al. (97), Marks et al. (98), and Breier et al. (99) showed the rate of alcoholism to be close to population prevalence rates (7%—17%). Of particular note are the studies by Bibb and Chambless (100) and by Thyer et al. (96). In the Bibb and Chambless study 21% of agoraphobic outpatients had "alcoholism" as defined by means of a self-report using the MAST. The rate of alcoholism fell from 21% to 13% when formal DSM-III criteria were applied. Similarly, the Thyer et al. study also used the MAST to define a case of alcoholism. It should also be noted that in the Amies et al. study anxiety symptoms and the quantity of alcohol used were recorded for subjects but formal criteria were not applied for either the diagnosis of agoraphobia or the definition of alcoholism.
In general, then, most published studies of alcoholism in patients with anxiety disorders do not show a marked excess of alcoholism over population prevalence rates. In the few studies that do, the excess may relate to important subgroups that require further study. However, the use of inappropriate diagnostic criteria for identifying a case or the use of especially high-risk patients might have contributed the few positive results.
Familial crossover between alcoholism and anxiety disorders
Is there a family crossover—that is, is there a higher than expected prevalence of alcoholism in the biological relatives of anxiety disorder probands and vice versa? To answer this question, two additional methodological issues must be considered. First, the distinction between family history and family study methods must be recognized. Through the family history method one obtains data about biological relatives only from an informant—usually the proband. This person may not have direct knowledge of the target individual and may rely on hearsay with respect to the information provided. This method frequently has low sensitivity and specificity with respect to many psychiatric disorders that are not typically associated with more extreme forms of behavioral dysfunction. The family study method involves direct interviews of all available biological relatives. Thus, detailed information can be obtained directly from the target individual. The second consideration is that the prevalences observed for different psychiatric disorders must be corrected for the ages of the subjects examined in order to determine the morbid risks. The age at which a person is most likely to become affected (i.e., the age of risk) varies across different psychiatric disorders. Therefore, the proportion of biological relatives who are not at risk, who have entered the risk period, or who have passed through the risk period varies according to the age of the individual family members and according to the particular disorder of interest. A number of age-correction methods are available, e.g., the Stromgren method. Age corrections are often necessary for making accurate comparisons of subject groups from multigeneration families or obtained from different populations.
Several studies (92—96) have examined the families of patients with panic disorder. Only two groups of investigators have reported rates of alcoholism in these biological family members that are higher than population prevalence rates. Crowe et al. (101) found a slightly higher than expected rate of alcoholism (18%), while Leckman et al. (102) reported a lifetime prevalence of 21% in the family members of probands with major depression and panic disorder. However, the rate of alcoholism dropped to approximately 16% when the families of probands who themselves also had alcoholism were excluded. Further, the rate of alcoholism among the biological relatives of probands with either depression plus generalized anxiety disorder or depression plus agoraphobia was approximately 11% with this exclusion. An additional two studies centering on panic disorder (91, 92) showed rates of alcoholism among both male and female relatives that were similar to or less than the population prevalence of alcoholism. In one of these (91) the family history method (versus direct interview) was used to examine the rates of alcoholism in family members of anxiety disorder patients.
The family members of patients with phobic disorders have also been studied with respect to the lifetime prevalence of alcoholism (103—105). Munjack and Moss (103) reported that 27% of the relatives of agoraphobic probands had a lifetime history of alcoholism, compared to 20% of the relatives of probands with social phobia. It should be noted that in the Munjack and Moss study the interviews with the relatives were conducted over the telephone, and the diagnosis of alcoholism was inferred and presumed on the basis of chronic alcohol problems in a first-degree relative as reported by the index subject. The more methodologically sound study by Noyes et al. showed similar rates of alcohol disorders in relatives of patients with panic disorder (7%) and comparison subjects (4%) but did give a rate of 13% for relatives of agoraphobics (104). Harris et al. (105) reported a prevalence of 30% among the male relatives of 20 agoraphobic probands. The overall morbid risk for alcoholism was found to be 18% among the male relatives of the 20 probands with panic disorder, compared to 10% of the male relatives of comparison subjects. It should also be noted that 35% of the probands also had diagnoses of substance use disorders. A recent direct interview family study of social phobia by Fyer et al. (106) failed to indicate any difference in the prevalence of alcohol abuse in the biological family members of the probands and in relatives of never-ill comparison subjects (5% versus 4%).
Of course, there are additional data of interest. One investigation evaluated the rate of "alcohol disorders" among relatives of individuals with generalized anxiety disorder, finding a morbid risk of 6% in the family members of the anxiety disorder patients and a morbid risk (age corrected) of 4% in the families of surgical comparison patients (107). Unfortunately, few studies have adequately investigated the rate of alcohol use disorders in relatives of individuals with other major anxiety syndromes.
Only a limited number of investigations have evaluated the risk of lifelong major anxiety disorders in the relatives of alcohol-dependent men and women. Merikangas et al. (108), in a study evaluating the crossover between depression and anxiety disorders, also evaluated the familial rate of alcohol use disorders. The authors reported that 5% of the relatives of a comparison group had one of the anxiety disorders, while the same was true for 20% of the relatives of a small subgroup of study subjects who themselves had both alcoholism and depression. The study methods were thorough, and the results are worthy of further evaluation. However, a substantial proportion of the relatives had antisocial personality disorder, which is associated with a chaotic lifestyle and high risk for drug dependence; the anxiety disorders reported included simple phobia, a common condition that is not thought to be a severe psychiatric disorder; and the co-occurrence of depression makes it difficult to establish the rates of alcoholism in the relatives of subjects who demonstrated only anxiety disorders. Even with these considerations, however, the study raises the question of some level of familial crossover for anxiety and alcohol use disorders in those complex patients.
In a recent study structured personal interviews were used to evaluate the rate of major psychiatric disorders in 605 interviewed first-degree relatives of alcohol-dependent men and women (40). After the potential impact of temporary anxiety syndromes in the context of their own alcohol or other drug use disorders was controlled for and after the data were analyzed separately following consideration of assortative mating, the rates of disorders among these interviewed relatives included 3% for panic disorder, 1% for agoraphobia, 2% for social phobia, and 1% for obsessive-compulsive disorder, yielding an overall rate of any major anxiety disorder in first-degree relatives of 7%. These results are not exceptionally higher than those expected in the general population.
In general, then, a review of the literature does not indicate a consistent family crossover between alcoholism and anxiety disorders once morbidity in the proband is controlled for and appropriate assessment methods and criteria are used. However, several of the investigators suggested that a modest level of crossover might be seen in some pedigrees. These results deserve further study.
Longitudinal prospective studies provide the best opportunity to follow the relationship between alcoholism and anxiety disorders over time and to document which disorder occurs first. With this approach, subjects are directly assessed before the onset of any disorder and are followed prospectively through the period of risk. Two published studies have directly examined the relationship of alcoholism to anxiety disorders in general population samples. The study by Hagnell and Tunvia (109) is a continuation of Essen-Moller’s study of the Lundby, Sweden, population. Personal interviews were conducted with 99% of the 950 men aged 20 years of age or older. No differences were found between men with alcoholism and those without alcoholism in terms of the population prevalence of anxiety disorders. This relationship held regardless of the severity (abuse, addiction, chronic) of the alcoholism studied. Ensminger et al. (110) reported data from the Woodlawn study on the relationship between levels of anxiety symptoms and the frequency of beer, liquor, marijuana, and cigarette use. However, the emphasis on symptoms rather than diagnoses makes the impact of this study only marginal. The sample of 16—17-year-old boys and girls participated in this prospective study for more than 10 years. The correlation between anxiety symptoms and substance use for both boys and girls was almost negligible (range, r=0.10 to r=—0.10). Similar findings have been reported by Kammeier et al. (111). Vaillant (47) has followed two groups of young men from adolescence into late adult life. He reported, "Prospective data from both the Core City and the College samples suggest that premorbidly anxious individuals were not at increased risk for alcoholism" (p. 77). He added, "In dismissing . . . depression and anxiety from major etiological consideration, [this is not to say they are of no importance in alcoholism]. These factors will make any chronic condition worse" (p. 311). He did not present the data supporting these statements. In summary, while the majority of the studies in this category do not suggest a close tie between lifelong anxiety disorders and alcoholism, there have been too few investigations to indicate any final conclusions.
There is little controversy regarding the conclusion that alcoholic men and women are more likely to demonstrate clinically relevant anxiety symptoms than are members of the general population. These symptoms include phobic behaviors, conditions that resemble generalized anxiety disorder, and repetitive panic attacks. Most clinicians would agree that when such symptoms are seen, it is important to take a number of common-sense clinical steps. Patients should be carefully evaluated for possible medical problems and psychiatric disorders that might have contributed to the anxiety symptoms, they should be reassured regarding the ability of the clinician to help them deal with these symptoms, and education and behavioral approaches aimed specifically at diminishing the symptoms should be offered (8).
However, the high prevalence of these anxiety symptoms does not necessarily mean that these alcoholic individuals will demonstrate the long-term course or require the long-term treatments associated with DSM-III-R major anxiety disorders. When one turns to six types of studies in the literature, there are contradictory conclusions. However, no one type of study alone is methodologically rigorous enough to yield definitive answers.
Tables 1T1 through 5T5 do not support the conclusion that the majority, or even a large minority, of alcoholics have lifelong major anxiety disorders. In this critical review of the literature, the evidence in these tables that might suggest a relationship relates to panic disorder; perhaps 6% to 7% of alcohol-dependent individuals might demonstrate an independent DSM-III-R panic syndrome. These figures are at least twice as high as those reported for the general population, although it is possible that the diagnosis among some alcoholics might represent continued alcohol-induced anxiety symptoms that did not predate the alcohol use disorder. Less impressive evidence is offered regarding a possible relationship between alcoholism and social phobia or generalized anxiety disorder. While the rate of anxiety disorders among alcoholics is a good deal lower than estimates given in some of the individual studies often cited in the literature, the possibility that an important minority of alcohol-dependent men and women might have independent lifelong major anxiety disorders, especially panic disorder, must be carefully entertained in future investigations. Yet the data do not justify a conclusion by clinicians that a large proportion of alcoholics really have lifelong panic disorder syndromes that must be treated.
Less impressive support for a relationship between anxiety and alcohol use disorders comes from an evaluation of the rate of alcoholism among patients with major anxiety syndromes. In contrast to the first type of investigation, most of the studies do not convincingly demonstrate higher rates of alcoholism (defined differently in different studies) among patients with anxiety disorders, even among those with panic disorder. While the few studies that have addressed the rate of alcoholism among individuals with social phobia deserve further consideration, none of the other major anxiety disorders appears to be common enough to support an overall close relationship between anxiety disorders and alcohol use disorders.
The potential relationships demonstrated from the first two types of studies must not be ignored, but neither prospective investigations of alcoholics or general population groups over time nor careful studies of children of alcohol-dependent individuals support an overall close tie between alcoholism and DSM-III-R major anxiety diagnoses. At the same time, despite the overall methodological rigor of these types of investigations, they do suffer from inconsistencies in the definitions of syndromes across studies. Additional difficulties here include the relative youth of many of the individuals incorporated in studies of children of alcoholics, as well as the small number of investigations of alcoholics over time. Finally, the last type of study reviewed, an evaluation of the familial crossover between alcohol use disorders and major anxiety disorders, offers no clearer conclusions. Most of these investigations were relatively negative or equivocal regarding a relationship. However, two of five investigations examining panic disorder indicated a slight, but possibly significant, familial crossover between the two types of syndromes.
When faced with inconclusive data, we can draw only limited conclusions. It is our belief that the high rates of panic disorder, social phobia, and generalized anxiety disorder among alcoholics (tables 1T1, 4T4, and 5T5) are likely to apply to only a relatively small group of alcohol-dependent men and women. Our own interpretation of this literature review suggests that even the adjusted figures in the tables might be exaggerated by problems in retrospective reporting of data and by the presence of symptoms of both acute and protracted withdrawal syndromes. We believe that if an excessively close relationship between anxiety disorders and a future risk for alcohol dependence existed, evaluations of children of alcoholics and longitudinal studies of individuals would have revealed more impressive results.
In considering these data, it is important to recognize that our own critical review of the literature suffered from several problems that could not be appropriately controlled. It is hoped that in future work in the six arenas we have outlined, closer attention will be paid to potential differences in anxiety and substance use disorders between men and women. In addition, optimal interpretation of data from any of these studies will require intensive efforts to establish an appropriate group of comparison subjects. Third, the most convincing data will require age corrections for the reported rates of both anxiety and alcohol use disorders. We also believe that in the future, emphasis must be placed on prospective evaluations of individuals with either of the two types of disorders under consideration and on longitudinal studies of their offspring. Finally, appropriate methods should be used to evaluate separately data regarding probands who did and did not complete treatment programs, as this factor could be related to personal and familial rates of comorbidity.
In conclusion, the relationship between symptoms of anxiety and alcohol use disorders is complex. Investigators must consider several important factors in interpreting these earlier studies. Similarly, just as clinicians recognize the need to carefully consider various potential organic etiologies for clinical patients that might imply different prognoses and unique treatment needs, it is important to carefully consider the implications of anxiety symptoms among alcoholics. Even syndromes that impair functioning and appear to fulfill diagnostic criteria for anxiety disorders do not necessarily indicate a lifelong anxiety syndrome; they are often temporary substance-induced anxiety symptoms likely to benefit from more short-term interventions.