The spectra of neurasthenia and depression: course, stability and transitions

Background: Neurasthenia has had a chequered history, receiving changing labels such as chronic fatigue or Gulf war syndrome. Neurasthenia is recognized by ICD-10, but not by DSM-IV. Its course, longitudinal stability and relationship to depression is not well understood. Methods: In a stratified community sample (n=591), representative of 2600 persons of the canton of Zurich, Switzerland, neurasthenia and depression were assessed in six structured interviews between ages 20 and 41. Course, stability and comorbidity were examined. A severity spectrum of neurasthenia and depression from symptoms to diagnosis was taken into account. Results: The annual prevalence of a neurasthenia diagnosis increased from 0.7% to 3.8% from age 22-41, while mere symptoms became less prevalent. Intraindividual courses improved in 40% and deteriorated in about 30% of symptomatic cases. The most frequent symptoms overall, besides criterial exhaustion, were increased need for sleep, over-sensitivity, nervousness and difficulty concentrating. Cross-sectional associations and overlap with depression were strong. Longitudinal stability of ICD-neurasthenia was low. Conclusions: Neurasthenia is intermittent, overlaps significantly with depression, and shows improvement and deterioration over time to roughly equal measure

Childhood adversity and chronicity of mood disorders

To evaluate the potential impact of early childhood problems on the chronicity of mood disorders. A representative cohort from the population was prospectively studied from ages 19/20 to 39/40. Unipolar (UP) and bipolar disorders (BP) were operationally defined applying broad Zurich criteria for bipolarity. Chronicity required the presence of symptoms for more days than not over 2years prior to an interview, or almost daily occurrence for 1year. A family history and a history of childhood problems were taken at ages 27/28 and 29/30. Data include the first of multiple self-assessments with the Symptom-Checklist-90 R at age 19/20, and mastery and self-esteem assessed 1year later. A factor analysis of childhood problems yielded two factors: family problems and conduct problems. Sexual trauma, which did not load on either factor, and conduct problems were unrelated to chronicity of UP or BP or both together. In contrast, childhood family problems increased the risk of chronicity by a factor of 1.7. An anxious personality in childhood and low self-esteem and mastery in early adulthood were also associated with chronicity. Childhood family problems are strong risk factors for the chronicity of mood disorders (UP and BP). The risk may be mediated partly by anxious personality traits, poor coping and low self-estee

Does psychomotor agitation in major depressive episodes indicate bipolarity?: Evidence from the Zurich Study

Background: Kraepelin's partial interpretation of agitated depression as a mixed state of "manic-depressive insanity” (including the current concept of bipolar disorder) has recently been the focus of much research. This paper tested whether, how, and to what extent both psychomotor symptoms, agitation and retardation in depression are related to bipolarity and anxiety. Method: The prospective Zurich Study assessed psychiatric and somatic syndromes in a community sample of young adults (N=591) (aged 20 at first interview) by six interviews over 20years (1979-1999). Psychomotor symptoms of agitation and retardation were assessed by professional interviewers from age 22 to 40 (five interviews) on the basis of the observed and reported behaviour within the interview section on depression. Psychiatric diagnoses were strictly operationalised and, in the case of bipolar-II disorder, were broader than proposed by DSM-IV-TR and ICD-10. As indicators of bipolarity, the association with bipolar disorder, a family history of mania/hypomania/cyclothymia, together with hypomanic and cyclothymic temperament as assessed by the general behavior inventory (GBI) [15], and mood lability (an element of cyclothymic temperament) were used. Results: Agitated and retarded depressive states were equally associated with the indicators of bipolarity and with anxiety. Longitudinally, agitation and retardation were significantly associated with each other (OR=1.8, 95% CI=1.0-3.2), and this combined group of major depressives showed stronger associations with bipolarity, with both hypomanic/cyclothymic and depressive temperamental traits, and with anxiety. Among agitated, non-retarded depressives, unipolar mood disorder was even twice as common as bipolar mood disorder. Conclusion: Combined agitated and retarded major depressive states are more often bipolar than unipolar, but, in general, agitated depression (with or without retardation) is not more frequently bipolar than retarded depression (with or without agitation), and pure agitated depression is even much less frequently bipolar than unipolar. The findings do not support the hypothesis that agitated depressive syndromes are mixed states. Limitations: The results are limited to a population up to the age of 40; bipolar-I disorders could not be analysed (small N

The spectra of neurasthenia and depression: course, stability and transitions

Background: Neurasthenia has had a chequered history, receiving changing labels such as chronic fatigue or Gulf war syndrome. Neurasthenia is recognized by ICD-10, but not by DSM-IV. Its course, longitudinal stability and relationship to depression is not well understood. Methods: In a stratified community sample (n=591), representative of 2600 persons of the canton of Zurich, Switzerland, neurasthenia and depression were assessed in six structured interviews between ages 20 and 41. Course, stability and comorbidity were examined. A severity spectrum of neurasthenia and depression from symptoms to diagnosis was taken into account. Results: The annual prevalence of a neurasthenia diagnosis increased from 0.7% to 3.8% from age 22-41, while mere symptoms became less prevalent. Intraindividual courses improved in 40% and deteriorated in about 30% of symptomatic cases. The most frequent symptoms overall, besides criterial exhaustion, were increased need for sleep, over-sensitivity, nervousness and difficulty concentrating. Cross-sectional associations and overlap with depression were strong. Longitudinal stability of ICD-neurasthenia was low. Conclusions: Neurasthenia is intermittent, overlaps significantly with depression, and shows improvement and deterioration over time to roughly equal measure

The generalized anxiety spectrum: prevalence, onset, course and outcome

Background: Generalized anxiety disorder (GAD) is generally considered to be a chronic condition, waxing and waning in severity; however prospective investigation of the course of GAD in community samples is lacking. This study seeks to fill that gap, by identifying the whole spectrum of generalized anxiety syndromes, sub-typing them according to their duration and frequency of occurrence, and evaluating their long-term course and outcome in the community. Method: The prospective Zurich Study assessed psychiatric and somatic syndromes in a community sample of young adults (N=591) (aged 20years at first interview) by six interviews over a period of 20years (1979-1999). GAD syndromes were defined by DSM-III symptom criteria without applying any exclusion criteria. A spectrum of generalized anxiety was defined by duration: 6months (DSM-IV), 1month (DSM-III), ≤2weeks (with weekly occurrence over one year), and anxiety symptoms. From 1978 (screening) to 1999 the annual presence of symptoms and treatment was assessed. Persistence of anxiety was defined by the almost daily presence of symptoms over the previous 12months. Results: The annual incidence of DSM-III GAD increased considerably between the ages of 20 and 40. The average age of onset of symptoms was 15.6years; in 75% of cases it occurred before the age of 20. 75 of 105 DSM-III GAD cases had at least one follow-up. At their individual last follow-up, 12 of those 75 subjects (16%) were re-diagnosed as having GAD, 22 (29%) manifested subthreshold syndromes or anxiety symptoms, while 39 cases, the majority, (52%) were symptom-free; 5 of the 12 re-diagnosed GAD cases were persistent (corresponding to 7% of all 75 initial GAD cases). In their twenties they were treated at some time in 6% of all years, but in their thirties this figure rose to 12%. At their individual last follow-up 26% of 6-month GAD subjects and 22% of 1-month GAD subjects were still being treated. Treated vs. non-treated subjects did not differ in terms of gender but did differ in severity, persistence and in comorbidity with bipolar-II disorder, social phobia, obsessive-compulsive syndromes and substance-use disorders. Limitations: Results are based on a relatively small sample and cannot be generalized to adults aged over 40years. Conclusions: The course of DSM-III-defined GAD may not be chronic, as previously suggested, but mainly recurrent with intervening symptom-free periods of recovery in about half of cases. Over a period of 20years there was more improvement than progression within the anxiety spectru

A new rating scale for adult ADHD based on the Symptom Checklist 90 (SCL-90-R)

Attention deficit hyperactivity disorder (ADHD) in adults is increasingly recognized as a clinically important syndrome. The aim of this study was to evaluate the psychometric performance of a new scale for adult ADHD based on the widely used Symptom Checklist 90 Revised (SCL-90-R). Scale performance was assessed in a clinical study including 100 ADHD patients and 65 opiate-dependent patient controls, and in the Zurich study, an epidemiological age cohort followed over 30years of adult life. Assessments included a ROC analysis of sensitivity and specificity, internal consistency, test-retest reliability, external validity and measurement invariance over nine testing occasions. The new scale showed a sensitivity and specificity of 75 and 54%, respectively, internal consistency over 0.8 (McDonald's omega, Cronbach's alpha), one-year test-retest reliabilities over 0.7, statistically significant and substantial correlations with two other validated self-rating scales of adult ADHD (R=0.5 and 0.66, respectively), and an acceptable degree of longitudinal stability (i.e., measurement invariance). The proposed scale must be further evaluated, but these preliminary results indicate it could be a useful rating instrument for adult ADHD in situations where SCL-90-R data, but no specific ADHD assessment, are available, such as in retrospective data analysis or in prospective studies with limited methodical resource

Obsessive-compulsive severity spectrum in the community: prevalence, comorbidity, and course

Abstract. : Objectives : : To describe lifetime prevalence rates, course and comorbidity of obsessive-compulsive disorder (OCD), obsessive-compulsive syndromes (OCS) and OC-symptoms (OC-sx) up to age 41. Methods : : In the Zurich community cohort study 591 subjects were selected after screening at the age of 19 and studied prospectively by 6 interviews from 20 to 40; they represent 1599 subjects of the normal population. The diagnoses of OCD met DSM-IV criteria.Course was assessed by graphic illustrations and prospective data. Results : : The lifetime prevalence rate was 3.5 % for OCD (males 1.7%, females 5.4 %) and 8.7 % for OCS (males 9.9%, females 7.5 %). The onset of OC-sx was 18 years (median); and in 70% before age 20.OCD was treated in one third of cases, OCS in 6.1%. The course of symptoms was chronic in 60%,but OCD and OCS showed in most cases considerable improvements over time. OCD reduced quality of life mostly in the subject's psychological wellbeing and at work but to a considerable extent also in other social roles. Comorbidity was prominent with bipolar disorder, panic disorder and social phobia and also significant with bulimia, binge eating, generalized anxiety disorder and suicide attempts; there was no association with substance abuse/dependence. Conclusion : : OCD and OCD are manifestations of a wide spectrum of severity with high prevalence and strong clinical validity. The long-term course is better than generally assume

How ubiquitous are physical and psychological complaints in young and middle adulthood?: A longitudinal perspective

Objectives: To investigate continuity and change of self-reported physical and psychological complaints in young adults over a period of 20years. Study design and setting: The Zurich Study - a long-term panel survey in psychiatric epidemiology - is based on a stratified sample of 591 subjects born in 1958 (women) and 1959 (men). The sample strata combine SCL-90-R high-scorers and low-scorers in a 2:1 ratio. Up to now, the Zurich Study has included six interviews between 1979 and 1999, i.e. 20 years of life in young adults. We analysed the longitudinal frequency data of a variety of physical and psychological complaints, as well as information about subjective suffering and use of professional help. The analyses utilised on the McNemar's test, the Q-test and Markov chain models. Results: Sleep disorders, depression, menstruation, backache, headache, stomach and bowel complaints yielded cumulative prevalence rates of 80% or higher. Physical and psychological complaints systematically differ with respect to the change patterns between 1979 and 1999. Moreover, strong differences were found in view of subjective suffering and use of professional help. Conclusions: Even though many self-reported physical and psychological complaints are very common in young adulthood, the underlying dynamics and the implications largely differ. It seems to be crucial whether respondents use somatic glasses or psychological lense

Is depression a risk factor for heart complaints?: Longitudinal aspects in the Zurich study

Background: The objective of this longitudinal study was to assess the association between major depression and heart complaints in a population of young and healthy adults. Methods: Starting at the age 20/21, participants of the Zurich Study underwent 6 structured, psychological interviews during a span of 20years. We evaluated longitudinal data from 277 persons who participated in all 6 interviews including questions about heart complaints. Results: Over 20years, heart complaints were reported by two thirds of participants, and the frequency of depression was 11.4%. At the age of 40/41, heart complaints were significantly associated with earlier heart complaints and major depression, both more often in women. Recurrent brief depression showed a tendency, but neither minor depression nor depressive symptoms were predictive for later heart complaints. Conclusions: This study suggests that major depression is a predictor for heart complaints at the age of 40 and that the severity of depressive disorder in younger age has an effect on subsequent heart complaints. Follow-up data will help to elucidate whether these subjective heart complaints show any correlation with a later coronary heart diseas