“Anxietas Tibiarum”

Abstract Background Symptoms of anxiety and depression in patients with restless legs syndrome (RLS) have been observed. However, it is unclear whether rates of threshold depression and anxiety disorders according to DSM-IV criteria in such patients are also elevated. Methods 238 RLS patients were assessed with a standardized diagnostic interview (Munich-Composite International Diagnostic Interview for DSM-IV) validated for subjects aged 18–65 years. Rates of anxiety and depressive disorders were compared between 130 RLS patients within this age range and 2265 community respondents from a nationally representative sample with somatic morbidity of other types. Results RLS patients revealed an increased risk of having 12-month anxiety and depressive disorders with particularly strong associations with panic disorder (OR=4.7; 95% CI=2.1–10.1), generalized anxiety disorder (OR=3.5; 95% CI= 1.7–7.1), and major depression (OR=2.6; 95% CI=1.5–4.4). In addition, lifetime rates of panic disorder and most depressive disorders as well as comorbid depression and anxiety disorders were considerably increased among RLS patients compared with controls. Conclusions The results suggest that RLS patients are at increased risk of having specific anxiety and depressive disorders. Causal attributions of patients suggest that a considerable proportion of the excess morbidity for depression and panic disorder might be due to RLS symptomatology.     

The Prevalence of Migraine Headaches in an Anxiety Disorders Clinic Sample

The association between migraine and psychiatric disorders has been reported in both clinical and epidemiological studies. The prevalence of psychiatric disorders has been found to be increased among individuals with migraine. Studies assessing migraine in psychiatric patients are limited and the majority of these studies have focused solely on examining patients with major depression. In the present study, we examined the prevalence and characteristics of migraine headache in an anxiety disorders clinic sample in order to better understand the relationship between these commonly associated conditions. We evaluated 206 consecutive outpatients to an Anxiety Disorders Clinic for the prevalence of migraine. The presence of migraine was established using International Headache Society Criteria. Subjects completed a modified self‐report version of the Headache Diagnostic Questionnaire. In order to assess the relationship between migraine and anxiety disorder symptom severity, subjects completed standardized measures of symptom severity. The prevalence of migraine in our anxiety disorder clinic sample was 67%. Anxiety disorder patients with migraine presented with a significantly greater number of comorbid psychiatric disorders than patients without migraine (P= 0.012). The prevalence of migraine was significantly higher in patients with a diagnosis of either panic disorder with agoraphobia (P= 0.048) or major depressive disorder/dysthymia (P= 0.008) compared to other psychiatric disorders. The severity of anxiety disorder symptoms was significantly higher in patients with migraine compared to patients without migraine. This study suggests that there is an increased prevalence of migraine headaches among anxiety disorder patients as compared to the general population. Migraine comorbidity may have important clinical implications, such that the treatment of one condition could potentially ameliorate the development or progression of the other. Further research is required to better understand the nature and implications of the association between migraine and psychiatric disorders.     

A diagnostic and family study of posttraumatic stress disorder

A family history study of 36 patients with chronic posttraumatic stress disorder revealed a positive history of familial psychopathology in 66% of the patients. Alcoholism, depression, and anxiety disorders were the disorders most commonly found. The patients also had a higher prevalence of alcoholic siblings than did a retrospectively derived control group of depressed and anxious male patients. With respect to the proportion of familial anxiety to familial depression, the probands with posttraumatic stress disorder more closely resembled probands with generalized anxiety than probands with depression. Every patient had experienced at least one significant psychiatric illness during his lifetime, most commonly alcohol abuse or depression.     

Bipolar disorder with comorbid cluster B personality disorder features: impact on suicidality

BACKGROUND: Because of their overlapping phenomenology and mutually chronic, persistent nature, distinctions between bipolar disorder and cluster B personality disorders remain a source of unresolved clinical controversy. The extent to which comorbid personality disorders impact course and outcome for bipolar patients also has received little systematic study. METHOD: One hundred DSM-IV bipolar I (N = 73) or II (N = 27) patients consecutively underwent diagnostic evaluations with structured clinical interviews for DSM-IV Axis I and cluster B Axis II disorders, along with assessments of histories of childhood trauma or abuse. Cluster B diagnostic comorbidity was examined relative to lifetime substance abuse, suicide attempt histories, and other clinical features. RESULTS: Thirty percent of subjects met DSM-IV criteria for a cluster B personality disorder (17% borderline, 6% antisocial, 5% histrionic, 8% narcissistic). Cluster B diagnoses were significantly linked with histories of childhood emotional abuse (p = .009), physical abuse (p = .014), and emotional neglect (p = .022), but not sexual abuse or physical neglect. Cluster B comorbidity was associated with significantly more lifetime suicide attempts and current depression. Lifetime suicide attempts were significantly associated with cluster B comorbidity (OR = 3.195, 95% CI = 1.124 to 9.088), controlling for current depression severity, lifetime substance abuse, and past sexual or emotional abuse. CONCLUSIONS: Cluster B personality disorders are prevalent comorbid conditions identifiable in a substantial number of individuals with bipolar disorder, making an independent contribution to increased lifetime suicide risk.     

Lifetime comorbidity of antisocial personality disorder and anxiety disorders among adults in the community

The association between lifetime anxiety disorders, conduct disorder (CD), and antisocial personality disorder (ASPD) among adults in the community was explored. Data were drawn from the National Comorbidity Survey (n = 5,877), a representative community sample of adults aged 15-54 in the 48 contiguous US states. Multiple logistic regression analyses were used to determine the association between anxiety disorders, CD and ASPD, and between the co-occurrence of anxiety disorders and ASPD in the likelihood of comorbid substance use and affective disorders, suicidal ideation (SI) and suicide attempt (SA). Out of the 3.3% of adults with ASPD, over half (54.33%) had a comorbid anxiety disorder (lifetime). Similarly, 42.31% of adults with a history of CD (9.4%) who did not meet criteria for ASPD had a lifetime anxiety disorder. Social phobia [OR = 1.65 (1.01, 2.7)] and post-traumatic stress disorder [OR = 2.28 (1.3, 4.0)] were associated with significantly increased odds of ASPD, after adjusting for differences in sociodemographic characteristics and other psychiatric comorbidity. Major depression was no longer significantly associated with ASPD after adjusting for anxiety disorders. The comorbidity of anxiety disorders and ASPD was associated with significantly higher odds of major depression, substance use disorders, and SI and SA compared with odds among those without both disorders. These data provide initial evidence of an association between PTSD and social phobia and an increased likelihood of ASPD among adults in the community, after adjustment for comorbid affective and substance use disorders. Adults with ASPD and comorbid anxiety had significantly higher levels of comorbid major depression, alcohol dependence, and substance dependence and substantially higher rates of lifetime suicidal ideation and suicide attempts compared to adults with ASPD or anxiety disorders alone or with neither disorder. Future studies are needed to replicate this finding using longitudinal data and to investigate the possible mechanisms of the observed links between anxiety disorders and ASPD.     

Low anxiety disorder comorbidity rate in bipolar disorders in Han Chinese in Taiwan

Objectives

Studies report high comorbidity of lifetime anxiety disorders with bipolar disorders in Western patients, but it is unclear in Taiwan. The authors explored the comorbidity of anxiety disorders in different bipolar disorder subtypes in Han Chinese in Taiwan.

Methods

Three hundred twenty-five patients with bipolar disorder (bipolar I: 120; bipolar II: 205) disorder were recruited from two general medical outpatient services. They were evaluated and their diagnoses confirmed by a psychiatrist using the Chinese version of the Modified Schedule of Affective Disorder and Schizophrenia-Lifetime. The exclusion criteria were: any DSM-IV-TR Axis I diagnosis, other than bipolar disorder, being outside the 18-65-year-old age range, any other major and minor mental illnesses except anxiety disorder, any neurological disorders or organic mental disorders.

Results

Thirty-two (26.7%) of patients were comorbid with lifetime anxiety disorder and bipolar I, 80 (39.0%) with lifetime anxiety disorder and bipolar II, 7 (5.8%) were comorbid with two or more anxiety disorders and bipolar I, and 27 (13.2%) with two or more anxiety disorders and bipolar II.

Conclusion

That more than twice as many bipolar II than bipolar I patients reported two or more anxiety disorders implies that the complication is more prevalent in bipolar II patients.     

Specificity of familial transmission of anxiety and comorbid disorders

This study examines the specificity and impact of comorbid disorders in probands on the familial transmission of panic and social anxiety disorders. It employs a contemporary family study design with 225 probands (with and without panic and social anxiety disorders) sampled from outpatient clinics and the local community. Their 1053 adult first-degree relatives were assessed for lifetime disorders, based on best estimate diagnoses derived from semi-structured psychiatric diagnostic interviews (Schedule for Affective Disorders and Schizophrenia), multi-informant family history information, and medical records. Generalized estimating equations were used to examine the familial aggregation of panic and social anxiety disorders, and the contributions of comorbid disorders. Results show specificity of familial aggregation of both panic disorder and social anxiety in probands and relatives (i.e., panic odds ratio=3.7, 95%CI 1.5-9.3; social anxiety odds ratio=1.8, 95%CI 1.1-2.9) after controlling for comorbid disorders. There was no contribution of common comorbid disorders (depression, alcoholism, generalized anxiety disorder and agoraphobia) in probands on the familial aggregation of either disorder. These findings confirm prior studies of specificity of familial transmission of panic and social anxiety disorders, and demonstrate that the association between these disorders in probands is not attributable to comorbid mood, anxiety or substance use disorders. Therefore, despite the high magnitude of co-occurrence of panic disorder and social anxiety, there may be distinct etiologic factors underlying each disorder. These findings have implications for studies of the etiology, genetics, and treatment of these disorders.     

Migraine, psychiatric disorders, and suicide attempts: an epidemiologic study of young adults

To determine the prevalence of migraine and the risks for psychiatric disorders and suicide attempts associated with it, we studied a random sample of 1,007 young adults from a large Health Maintenance Organization in the Detroit, MI area. The lifetime prevalence of migraine was 7% in males and 16.3% in females. The rate of migraine was higher in persons with lower education and was equal in whites and blacks. Persons with migraine were at increased risk for affective and anxiety disorders, nicotine dependence, and alcohol or illicit drug abuse or dependence. There was a consistent trend toward higher psychiatric comorbidity in migraine with aura than in migraine without aura. Coexisting anxiety, which generally preceded migraine, was associated with a marked increase in the odds of major depression. Persons with migraine had higher rates of suicide attempts than persons without migraine. The odds ratio for suicide attempts, adjusted for coexisting major depression and other psychiatric and substance use disorders, in migraine with aura was 3.0 (95% confidence interval, 1.4-6.6). The coexistence of migraine with major depression, anxiety disorders, and suicide attempts has important clinical and research implications.     

Psychopathology among adults abused during childhood or adolescence: results from the Israel-based World Mental Health Survey

Childhood and adolescence abuse is a risk factor for later psychopathology. We examined the association between the age when sexual (SA) and physical (PA) abuse first occurred and mood and anxiety disorders and their respective age of onset, emotional distress, and sleep disturbances. Data were gathered from the Israel-based component of the World Mental Health Survey (N = 4859). Abuse was elicited by direct questions. Psychiatric disorders were diagnosed with the Composite International Diagnostic Interview, emotional distress with the 12-item General Health Questionnaire, and sleep disturbances by self-report. Multivariate analyses indicated an increased risk for psychopathology among subjects who reported childhood SA and PA. SA was associated with lifetime mood (odds ratio [OR] = 1.7) and anxiety (OR = 2.3) disorders; PA with lifetime anxiety disorder (OR = 2.8); and any abuse with increased risk for lifetime mood (OR = 1.7) and 12-month anxiety disorders (OR = 1.8). Earlier onset of SA or PA was associated with increased risk for later psychopathology.     

Anxiety and major depression comorbidity in a family study of obsessive-compulsive disorder

To understand the familial relationship between obsessive-compulsive disorder (OCD), other anxiety disorders, and major depressive disorder (MDD), we examined the rates of anxiety disorders and MDD in first-degree relatives of OCD probands and controls, the association between age at onset of OCD and the occurrence of other anxiety disorders and major depressive disorder in relatives of probands, and the co-transmission of specific anxiety disorders, MDD, and OCD within families of probands. Recurrence risks were estimated from 466 first-degree relatives of 100 probands with OCD and 113 first-degree relatives of 33 non-psychiatric controls. Rates of non-OCD anxiety disorders and MDD were comparable in relatives of OCD probands and controls. Rates of anxiety disorders and MDD were higher among case relatives with OCD than among case relatives without OCD and control relatives. Fifty percent of case relatives with OCD had at least one comorbid anxiety disorder. Early age at onset (<10 years) in probands was associated with higher rates of anxiety and depression comorbidity among case relatives with OCD but not among case relatives without OCD. The occurrence of specific anxiety disorders and MDD in case relatives was independent of the same comorbid diagnosis in the OCD probands. OCD, panic disorder, generalized anxiety disorder, and MDD occurred together more often than expected by chance among individuals with OCD. Furthermore, age at onset in probands is associated with specific anxiety and affective comorbidity among case relatives. These findings support the hypothesis that early- and late-onset OCD represent different etiologic variants.     

Psychiatric comorbidities of episodic and chronic migraine

Migraine is a prevalent disabling neurological disorder associated with a wide range of medical and psychiatric comorbidities. Population- and clinic-based studies suggest that psychiatric comorbidities, particularly mood and anxiety disorders, are more common among persons with chronic migraine than among those with episodic migraine. Additional studies suggest that psychiatric comorbidities may be a risk factor for migraine chronification (i.e., progression from episodic to chronic migraine). It is important to identify and appropriately treat comorbid psychiatric conditions in persons with migraine, as these conditions may contribute to increased migraine-related disability and impact, diminished health-related quality of life, and poor treatment outcomes. Here, we review the current literature on the rates of several psychiatric comorbidities, including depression, anxiety, and post-traumatic stress disorder, among persons with migraine in clinic- and population-based studies. We also review the link between physical, emotional, and substance abuse, psychiatric disorders, and migraine. Finally, we review the data on psychiatric risk factors for migraine chronification and explore theories and evidence underlying the comorbidity between migraine and these psychiatric disorders.     

Further evidence for family-genetic risk factors in attention deficit hyperactivity disorder. Patterns of comorbidity in probands and relatives psychiatrically and pediatrically referred samples.

We examined 140 probands with attention deficit hyperactivity disorder, 120 normal controls, and their 822 first-degree relatives using "blind" raters and structured diagnostic interviews. Compared with controls, probands with attention deficit hyperactivity disorder were more likely to have conduct, mood, and anxiety disorders. Compared with relatives of controls, relatives of probands with attention deficit hyperactivity disorder had a higher risk for attention deficit hyperactivity disorder, antisocial disorders, major depressive disorder, substance dependence, and anxiety disorders. Patterns of comorbidity indicate that attention deficit hyperactivity disorder and major depressive disorders may share common familial vulnerabilities, that attention deficit hyperactivity disorder plus conduct disorder may be a distinct subtype, and that attention deficit hyperactivity disorder and anxiety disorders are transmitted independently in families. These results extend previous findings indicating family-genetic influences in attention deficit hyperactivity disorder by using both pediatrically and psychiatrically referred proband samples. The distributions of comorbid illnesses in families provide further validation for subgrouping probands with attention deficit hyperactivity disorder by comorbidity.     

Factors associated with repeat suicide attempts among adolescents

OBJECTIVE: To determine potential risk factors associated with repeat suicide attempts among adolescents. METHOD: Retrospective medical record review of all patients aged 13-20 years who presented to the emergency department at an inner city tertiary hospital after attempted suicide between 1994 and 1996. Subjects were identified using the International Classification of Diseases (ICD-9) codes E950.0 to E959.9 for attempted suicide. Study variables included demographic parameters, chronic medical conditions/illnesses, psychiatric and substance abuse disorders, history of sexual abuse and previous and subsequent suicide attempts. Variables univariately associated with repetition at p < 0.25 were entered into a multiple regression analysis. RESULTS: Eighty seven per cent of patients presented with a drug overdose. Seventy-six per cent of all subjects attempted suicide in the context of a dispute or relationship break-up. At least one psychiatric disorder was present in 76% of subjects at the index attempt. The most frequently diagnosed disorders were depression (45.5%) and drug (34%) and alcohol abuse (27%). Variables predicting repetition within 12 months were drug (OR = 3.891, p = 0.02) and alcohol abuse (OR = 3.56, p = 0.05), non-affective psychotic disorders (OR = 3.81, p = 0.04), and chronic medical conditions/illness (OR = 3.29, p = 0.03). A history of sexual abuse was almost significant (OR = 3.03, p = 0.06). CONCLUSIONS: Adolescents most likely to re-attempt suicide with 12 months present with either substance abuse, non-affective psychotic disorders, chronic medical conditions, or a history of sexual abuse. All adolescents with a possible suicide attempt should receive a comprehensive mental health and psychosocial assessment. Closer scrutiny of the role of chronic illnesses and sexual abuse in both future research and clinical management is urged. A broad based, multidisciplinary intervention approach is recommended.     

The characteristics of the comorbidity between social anxiety and separation anxiety disorders in adult patients

Abstract

Objective: In the present study, we compared social anxiety disorder (SAD) patients with (n?=?31) and without childhood and adulthood separation anxiety disorder (SeAD) (n?=?50) with respect to suicidal behavior, avoidant personality disorder (AvPD), other anxiety disorders (ADs), and major depression as well as some sociodemographic variables.

Methods: In assessment of patients, we used Structured Clinical Interview for Separation Anxiety Symptoms, childhood and adulthood Separation Anxiety Symptom Inventories, Liebowitz Social Anxiety Scale, The SCID-II Avoidant Personality Disorder Module, Beck Depression Inventory, and Beck Scale for Suicidal Ideation.

Results: SAD patients with SeAD had higher comorbidity rates of AvPD, other lifetime ADs and panic disorder, and current major depression than those without SeAD. The current scores of SAD, depression, and suicide ideation and the mean number of AvPD symptoms were significantly higher in comorbid group compared to pure SAD subjects. The SAD and SeAD scores had significant associations with current depression, suicide ideations, and AvPD. The mean number of AvPD criteria and the current severity of depression were significantly associated with the comorbidity between SAD and SeAD.

Conclusion: Our findings might indicate that the comorbidity of SeAD with SAD may increase the risk of the severity of AvPD and current depression.     

Prevalence of Mental Disorders from Adolescence Through Early Adulthood in American Indian and First Nations Communities

Indigenous communities lack representation in psychiatric epidemiology despite disproportionate exposure to risk factors. We document the cumulative and 12-month prevalence of psychiatric disorders across the early life course among a sample of Indigenous young adults and compare prospective and retrospective reporting of lifetime mental disorders. This community-based participatory research includes data from 735 Indigenous people from 8 reservations/reserves. Personal interviews were conducted between 2002–2010 and 2017–2018 totaling 9 waves; diagnostic assessments of DSM-IV-TR alcohol abuse/dependence, marijuana use/dependence, other substance abuse/dependence, generalized anxiety disorder, major depressive disorder, dysthymic disorder, and attention deficit/hyperactivity disorder occurred at waves 1 (mean age = 11.1 years), 4 (mean age = 14.3 years), 6 (mean age = 16.2 years), 8 (mean age = 18.3 years), and 9 (mean age = 26.3 years). Cumulative lifetime psychiatric disorders reached 77.3% and lifetime comorbidity 56.4% by wave 9. Past-year prevalence and comorbidity at wave 9 were 28.7% and 6.7%, respectively. Substance use disorders (SUDs) were most common with peak past-year prevalence observed when participants were on average 16.3 years old then declining thereafter. Trends in early life course psychiatric disorders in this study with Indigenous participants highlight cultural variations in psychiatric epidemiology including surprisingly low rates of internalizing disorders in the face of risk factors, disproportionately high rates of early-onset and lifetime SUD, and lower rates of past-year SUD in early adulthood compared with prior research.

     

Comorbidity of fibromyalgia and psychiatric disorders

OBJECTIVE: To assess the co-occurrence of fibromyalgia with psychiatric disorders in participants of a fibromyalgia family study. METHOD: Patients (probands) with fibromyalgia, control probands with rheumatoid arthritis, and first-degree relatives of both groups completed a structured clinical interview and tender point examination. The co-occurrence odds ratio (OR) (the odds of a lifetime comorbid DSM-IV disorder in an individual with fibromyalgia divided by the odds of a lifetime comorbid disorder in an individual without fibromyalgia, adjusted for age and sex) was calculated; observations were weighted by the inverse probability of selection, based on the fibromyalgia status of the pro-band; and standard errors were adjusted for the correlation of observations within families. The study was conducted from September 1999 to April 2002. RESULTS: We evaluated 78 fibromyalgia pro-bands and 146 of their relatives, and 40 rheumatoid arthritis probands and 72 of their relatives. Among the relatives of both proband groups, we identified 30 cases of fibromyalgia, bringing the total number of individuals with fibromyalgia to 108, compared with 228 without fibromyalgia. The co-occurrence ORs for specific disorders in individuals with versus those without fibromyalgia were as follows: bipolar disorder: 153 (95% CI = 26 to 902, p < .001); major depressive disorder: 2.7 (95% CI = 1.2 to 6.0, p = .013); any anxiety disorder: 6.7 (95% CI = 2.3 to 20, p < .001); any eating disorder: 2.4 (95% CI = 0.36 to 17, p = .36); and any substance use disorder: 3.3 (95% CI = 1.1 to 10, p = .040). CONCLUSIONS: There is substantial lifetime psychiatric comorbidity in individuals with fibromyalgia. These results have important clinical and theoretical implications, including the possibility that fibromyalgia might share underlying pathophysiologic links with some psychiatric disorders.     

Bipolar II and unipolar comorbidity in 153 outpatients with social phobia

Previous studies on social phobia (SP) have focused largely on comorbidity between SP and major depression. Less attention has been devoted to the comorbidity between SP and bipolar disorder. In this retrospective study, we investigated family history, lifetime comorbidity, and demographic and clinical characteristics among 153 outpatients who met DSM-III-R diagnostic criteria for SP. Information regarding axis I diagnoses was obtained using the Structured Clinical Interview for DSM III-R (SCID-UP-R). Social phobic symptoms and the severity of the illness were assessed by the Liebowitz Social Anxiety Scale (LSAS) and the Liebowitz Social Phobic Disorders Rating Scale, Severity (LSPDRS). Patients completed the Hopkins Symptom Checklist (HSCL 90). Fourteen patients (9.1%) satisfied DSM-III-R criteria for lifetime bipolar disorder not otherwise specified (NOS) (bipolar II), while 71 (46.4%) had unipolar major depression and 68 (44.4%) had no lifetime history of major mood disorders. Comorbid panic disorder/agoraphobia (PDA), obsessive-compulsive disorder (OCD), and alcohol abuse were reported more frequently in the bipolar group than in the other two subgroups. Unipolar patients showed higher rates of comordid PDA and OCD compared with SP patients without mood disorders. Severity and generalization of the SP symptoms, prevalent interactional anxiety, multiple comorbidity, and alcohol abuse appeared to be the most relevant consequences of SP-bipolar coexistence. In a significant minority of cases, protracted social anxiety may hypothetically have represented, along with inhibited depression, the dimensional opposite of gregarious hypomania.     

Chernobyl exposure as stressor during pregnancy and behaviour in adolescent offspring

Objective: Research in animals has shown that exposure to stressors during pregnancy is associated with offspring behavioural disorders. We aimed to study the effect of in utero exposure to the Chernobyl disaster in 1986, and maternal anxiety presumably associated with that exposure, on behaviour disorder observed at age 14. Method: Exposed (n = 232) and non‐exposed Finnish twins (n = 572) were compared. A semi‐structured interview was used to assess lifetime symptoms of depression, generalized anxiety disorder, attention deficit hyperactivity disorder, conduct disorder and oppositional defiant disorder symptoms. Results: Adolescents who were exposed from the second trimester in pregnancy onwards, had a 2.32‐fold risk (95% CI: 1.13–4.72) of having lifetime depression symptoms, an increased risk of fulfilling DSM‐III‐R criteria of a major depressive disorder (OR = 2.48, 95% CI: 1.06–5.7), and a 2.01‐fold risk (95% CI: 1.14–3.52) of having attention deficit hyperactivity disorder symptoms. Conclusion: Perturbations in fetal brain development during the second trimester may be associated with the increased prevalence of depressive and attention deficit hyperactivity disorder symptoms.     

Bipolar II disorder and comorbidity

The validity and reliability of the diagnosis of bipolar II disorder has been questioned by means of comorbidity with nonaffective disorders, including substance abuse, personality disorders, and anxiety disorders. This study examined the comorbid diagnosis of a sample of bipolar II patients, comparing patients with comorbidity and those with "pure" bipolar II disorder. Forty Research Diagnostic Criteria (RDC) bipolar II patients were assessed by means of the Schedule for Affective Disorders and Schizophrenia, Lifetime Version (SADS-L) and Structured Clinical Interview for DSM-III-R axis I (SCID-II) for personality disorders. Patients fulfilling RDC criteria for any psychiatric disorder (except personality disorders) or DSM-IV criteria for any personality disorder were compared with patients without comorbidity. For practical reasons, cyclothymia was not considered as a comorbid diagnosis. Half of the sample had lifetime comorbidity with other psychiatric disorders, mainly personality disorders (33%), substance abuse or dependence (21%), and anxiety disorders (8%). However, only the rates of suicidal ideation (74% v 24%, chi square [chi2] = 9.03, P = .003) and suicide attempts (45% v 5%, chi2 = 8.53, P = .003) were significantly different between patients with and without comorbidity. In summary, although the rates of comorbidity are relatively high in bipolar II disorder, most clinical and course variables are strikingly similar in patients with and without comorbidity except for suicidal behavior, suggesting that comorbidity does not reduce the validity of the diagnosis of bipolar II disorder.