Time trends in depression prevalence and health-related correlates: results from population-based surveys in Germany 1997-1999 vs. 2009-2012.

BACKGROUND: Although an "epidemic" of depression is frequently claimed, empirical evidence is inconsistent, depending on country, study design and depression assessment. Little is known about changes in depression over time in Germany, although health insurance companies report frequency increases. Here we examined time trends in depression prevalence, severity and health-related correlates in the general population. METHODS: Data were obtained from the mental health module of the "German Health Interview and Examination Survey for Adults" (2009-2012, n = 3265) and the mental health supplement of the "German National Health Interview and Examination Survey 1998" (1997-1999, n = 4176), excluding respondents older than 65. 12-month major depressive disorder (MDD), severity and symptoms were assessed based on the WHO Composite International Diagnostic Interview. Health-related quality of life (SF-36), self-reported sick days or days with limitations in normal daily life activities were examined, too. Calculations were carried out population-weighted. Additional age-standardized analyses were conducted to account for demographic changes. RESULTS: Overall, MDD 12-month prevalence remained stable at 7.4%. Women showed a shifted age distribution with increased prevalence at younger ages, and increasing MDD severity. Time trends in health-related correlates occurred both in participants with and without MDD. Mental health disability increased over time, particularly among men with MDD, reflected by the mental component score of the SF-36 and days with activity limitation due to mental health problems. Demographic changes had a marginal impact on the time trends. CONCLUSIONS: In contrast to the ongoing international debate regarding increased depression rates in western countries, we found no increase in overall MDD prevalence in Germany over a long period. In conclusion, increased depression frequencies in national health insurance data and growing health care costs associated with depression are not attributable to overall prevalence changes at a population level. However, shifted age distribution and increased severity among women may reflect a rising depression risk within this specific subgroup, and changes in health-related correlates indicate a growing mental health care need for depression, particularly among men.

Respondents' report of a clinician-diagnosed depression in health surveys: comparison with DSM-IV mental disorders in the general adult population in Germany.

BACKGROUND: Respondents' report of a previously diagnosed depression by a health professional is frequently used to estimate depression prevalence. This study contributes to a better understanding of survey results based on this measure by comparing it with a comprehensive standardized diagnostic interview. METHODS: Data came from the cross-sectional nationwide German Health Interview and Examination Survey for Adults (DEGS1) and its mental health module (DEGS1-MH, n = 4483). In DEGS1, participants were asked whether they have been diagnosed with depression by a physician or psychotherapist (last 12-month). DSM-IV-based 12-month major depressive disorder (MDD) and other mental disorders were assessed with the German version of the Composite International Diagnostic Interview (CIDI). Time lag between both assessments was 6 weeks (median). RESULTS: 73.4% of participants reporting clinician-diagnosed depression met criteria for any mental disorder in the CIDI (any affective disorder: 51.8%, any anxiety disorder: 54.7%). The proportion of participants reporting a clinician-diagnosed depression who met MDD criteria was highest among those aged 18-29 years (62.6%) and decreased with age (65-79 years: 29.8%). Among participants with MDD, the proportion with clinician-diagnosed depression was 33.0%, highest among those aged 45-64 years (49.3%) and lowest among those aged 18-29 years (22.7%) and 30-44 years (20.3%). MDD severity was positively associated with clinician-diagnosed depression. CONCLUSIONS: Respondents' report of a clinician-diagnosed depression and major depression assessed with the CIDI substantially differ. Concordance of both measures varies with age and severity of depressive symptoms. Health surveys should assess a range of depression indicators in order to cover a wide spectrum.

Current major depressive syndrome measured with the Patient Health Questionnaire-9 (PHQ-9) and the Composite International Diagnostic Interview (CIDI): results from a cross-sectional population-based study of adults in Germany.

BACKGROUND: Prevalence estimates for depression vary considerably by the type of assessment instrument, and there is limited information on their overlap in population-based samples. Our aim was to compare the Patient Health Questionnaire-9 (PHQ-9) with the Composite International Diagnostic Interview (CIDI) as measures for current major depressive syndrome (MDS) in a large population-based sample. METHODS: Data derived from the mental health module of the nationwide cross-sectional German Health Interview and Examination Survey for Adults (DEGS1-MH) (n = 4483; age 18-79 years). MDS in the past two weeks was assessed (a) using the PHQ-9 diagnostic algorithm (PHQ-MDS) and (b) based on CIDI information about the latest symptom occurrence (recency) (CIDI-MDS). Prevalences, overall concordance and percentages of overlap of both MDS measures were determined. Prevalences of affirmed PHQ-9 depression symptoms and the mean and median PHQ-9 sum scores were analyzed per measure. RESULTS: Prevalence of current MDS was 2.7% (95% CI: 2.0-3.6) for PHQ-MDS and 3.9% (95% CI: 3.1-5.0) for CIDI-MDS. The overall agreement between both measures was moderate (kappa: 0.43). Of all the participants, 1.5% (95% CI: 1.0-2.2) were classified as MDS cases by both measures, with 54.5% (95% CI: 42.7-65.9) of PHQ-MDS cases and 37.9% (95% CI: 27.8-49.1) of CIDI-MDS cases also being classified as MDS by the respective other MDS measure. However, 94.8% (95% CI: 93.6-95.8) of the participants were classified as non-MDS by both measures, with 97.5% (95% CI: 96.6-98.1) of non-PHQ-MDS and 98.7% (95% CI: 98.2-99.1) of non-CIDI-MDS being classified as non-MDS by the respective other MDS measure. The mean and median PHQ-9 sum score was higher in those with PHQ-MDS than in those with CIDI-MDS. CONCLUSIONS: Both measures have a high level of agreement for ruling out current MDS, but the overlap in their classification of cases is moderate. Our results indicate that they cannot be interpreted as equal measures of the same construct, suggesting limited comparability of their prevalence estimates. However, further exploration of algorithms and correlates and a proper labeling of measures in epidemiological studies are required.

[Diagnosed Depression and Utilization of Health Care Services and Preventive Measures in the General Adult Population in Germany - Results from a Nationwide Cross-Sectional Telephone Survey]. / Diagnostizierte Depression und Inanspruchnahme von medizinischen Versorgungs- und Vorsorgeleistungen bei Erwachsenen in Deutschland.

OBJECTIVE: To examine the association of diagnosed depression with the utilization of health care services and preventive measures among men and women in the general population in Germany. METHODS: Cross-sectional analysis of data from a representative telephone survey (men N = 18,675, women N = 24,518, 18 years and older). Self-reported health professional-diagnosed depression (past 12 months) and the use of a range of health care and preventive services were assessed. RESULTS: Diagnosed depression was associated with increased health care service utilization in both sexes. Diagnosed depression was associated with higher utilization of some preventive services, such as general health check-ups (odds ratio [OR] 1.2), cancer screening (OR 1.2) and flu vaccination (OR 1.3) among women and cancer screening (OR 1.4) among men. CONCLUSIONS: Health professional-diagnosed depression is associated with increased health service utilization independent of somatic comorbidity and socio-demographic confounders. There was no indication for specific under-treatment with preventive measures among people with depression diagnosis.

Social Inequalities and Depressive Symptoms in Adults: The Role of Objective and Subjective Socioeconomic Status.

BACKGROUND: There is substantial evidence that lower objective socioeconomic status (SES)-as measured by education, occupation, and income-is associated with a higher risk of depression. Less is known, however, about associations between perceptions of social status and the prevalence of depression. This study investigated associations of both objective SES and subjective social status (SSS) with depressive symptoms among adults in Germany. METHODS: Data were obtained from the 2013 special wave of the German Health Update study, a national health survey of the adult population in Germany. Objective SES was determined using a composite index based on education, occupation, and income. The three single dimensions of the index were also used individually. SSS was measured using the MacArthur Scale, which asks respondents to place themselves on a 10-rung 'social ladder'. Regression models were employed to examine associations of objective SES and SSS with current depressive symptoms, as assessed with the eight-item Patient Health Questionnaire depression scale (PHQ-8 sum score ≥10). RESULTS: After mutual adjustment, lower objective SES and lower SSS were independently associated with current depressive symptoms. The associations were found in both sexes and persisted after further adjustment for sociodemographic factors, long-term chronic conditions, and functional limitations. Mediation analyses revealed a significant indirect relationship between objective SES and depressive symptoms through SSS. When the three individual dimensions of objective SES were mutually adjusted, occupation and income were independently associated with depressive symptoms. After additional adjustment for SSS, these associations attenuated but remained significant. CONCLUSIONS: The findings suggest that perceptions of low social status in adults may be involved in the pathogenesis of depression and play a mediating role in the relationship between objective SES and depressive symptoms. Prospective studies are needed to establish the direction of effects and to address questions of causality.

[Prevalence and Comorbidity of Self-Reported Diagnosis of Burnout Syndrome in the General Population - Results of the German Health Interview and Examination Survey for Adults (DEGS1)]. / Häufigkeit und psychiatrische Komorbiditäten von selbstberichtetem diagnostiziertem Burnout-Syndrom.

Objective: To determine the prevalence and comorbid mental disorders of self-reported diagnosis of burnout syndrome in the general population of Germany. Methods: In the German Health Interview and Examination Survey (DEGS1) self-reported diagnosis of a burnout syndrome made by a physician or psychotherapist was assessed in a standardized interview (N = 7987). For N = 4483 mental disorders were determined with the Composite International Diagnostic Interview (CIDI). Weighted lifetime and 12-month prevalences were calculated. Results: Lifetime prevalence of diagnosed burnout syndrome was 4.2 % (women 5.2 %, men 3.3 %), 12-month prevalence was 1.5 % (women 1.9 %, men 1.1 %). Highest prevalences were found in 40 - 59 year olds, in people with middle and high socio-economic status and in women with low and men with high social support. Among the 12-month cases, 70.9 % had at least one DSM-IV disorder. Associations were found for the diagnosis of burnout syndrome with somatoform, affective and anxiety disorders. Conclusion: The diagnosis of burnout syndrome is less frequently given and reported than expected. People with a burnout diagnosis often have a manifest mental disorder.

[Prevalence and Comorbidity of Self-Reported Diagnosis of Burnout Syndrome in the General Population]. / Häufigkeit und psychiatrische Komorbiditäten von selbstberichtetem diagnostiziertem Burnout-Syndrom.

OBJECTIVE: To determine the prevalence and comorbid mental disorders of self-reported diagnosis of burnout syndrome in the general population of Germany. METHODS: In the German Health Interview and Examination Survey (DEGS1) self-reported diagnosis of a burnout syndrome made by a physician or psychotherapist was assessed in a standardized interview (N = 7987). For N = 4483 mental disorders were determined with the Composite International Diagnostic Interview (CIDI). Weighted lifetime and 12-month prevalences were calculated. RESULTS: Lifetime prevalence of diagnosed burnout syndrome was 4.2 % (women 5.2 %, men 3.3 %), 12-month prevalence was 1.5 % (women 1.9 %, men 1.1 %). Highest prevalences were found in 40 - 59 year olds, in people with middle and high socio economic status and in women with low and men with high social support. Among the 12-month cases, 70.9 % had at least one DSM-IV disorder. Associations were found for the diagnosis of burnout syndrome with somatoform, affective and anxiety disorders. CONCLUSION: The diagnosis of burnout syndrome is less frequently given and reported than expected. People with a burnout diagnosis often have a manifest mental disorder.

Prevalence and correlates of DSM-IV-TR major depressive disorder, self-reported diagnosed depression and current depressive symptoms among adults in Germany.

BACKGROUND: While standardized diagnostic interviews using established criteria are the gold standard for assessing depression, less time consuming measures of depression and depressive symptoms are commonly used in large population health surveys. We examine the prevalence and health-related correlates of three depression measures among adults aged 18-79 years in Germany. METHODS: Using cross-sectional data from the national German Health Interview and Examination Survey for Adults (DEGS1) (n=7987) and its mental health module (DEGS1-MH) (n=4483), we analysed prevalence and socio-demographic and health-related correlates of (a) major depressive disorder (MDD) established by Composite International Diagnostic Interview (CIDI) using DSM-IV-TR criteria (CIDI-MDD) in the last 12 months, (b) self-reported physician or psychotherapist diagnosed depression in the last 12 months, and (c) current depressive symptoms in the last two weeks (PHQ-9, score ≥10). RESULTS: Prevalence of 12-month CIDI-MDD was 4.2% in men and 9.9% in women. Prevalence of 12-month self-reported health professional-diagnosed depression was 3.8% and 8.1% and of current depressive symptoms 6.1% and 10.2% in men and women, respectively. Case-overlap between measures was only moderate (32-45%). In adjusted multivariable analyses, depression according to all three measures was associated with lower self-rated health, lower physical and social functioning, higher somatic comorbidity (except for women with 12-month CIDI-MDD), more sick leave and higher health service utilization. LIMITATIONS: Persons with severe depression may be underrepresented. Associations between CIDI-MDD and correlates and overlap with other measures may be underestimated due to time lag between DEGS1 and DEGS1-MH. CONCLUSIONS: Prevalence and identified cases varied between these three depression measures, but all measures were consistently associated with a wide range of adverse health outcomes.

[Comorbidity of diabetes mellitus and depression in the general population in Germany]. / Komorbidität von Diabetes mellitus und Depression in Deutschland.

OBJECTIVE: To assess the comorbidity of diabetes and depression in the adult general population of Germany. METHODS: Data (n = 43 312) derived from the representative cross-sectional telephone survey "German Health Update (GEDA)". Information about diagnosed chronic somatic diseases including diabetes and diagnosed depression was available for residents in private households. Age- and sex-specific adjusted logistic regressions were used to examine the association between diabetes and depression. RESULTS: 12-month prevalences: diagnosed diabetes 7.4 %, diagnosed depression 6.7 %, comorbidity of both 0.8 %. An association of diabetes and depression was found in people < 50 years and in women aged 50 - 64 years. This association was dependent on the number of additional chronic diseases. CONCLUSION: Comorbidity of diabetes and depression was quite rare. Yet according to our results every 10(th) adult with diagnosed diabetes gets a depression diagnosis and every 9(th) adult with diagnosed depression has known diabetes. Underestimation for men and older adults due to diagnostic bias is possible. The combination of diabetes and depression is relevant for medical care because of its health burden.

Self-reported utilization of mental health services in the adult German population--evidence for unmet needs? Results of the DEGS1-Mental Health Module (DEGS1-MH).

This paper provides up-to-date data on service use for mental health problems and disorders among adults aged 18-79 years in Germany derived from the Mental Health Module of the German Health Interview and Examination Survey for Adults (DEGS1-MH; N=4483). Data are based exclusively on self-report. Respondents were examined by clinically trained interviewers with a modified version of the Composite International Diagnostic Interview DIA-X/M-CIDI to assess diagnoses according to the criteria of DSM-IV-TR. Service use, i.e. contact to mental health care services, due to mental health problems was assessed for the past 12 months and lifetime, by type of sector and type of institution. Among respondents with a 12-month diagnosis of a mental disorder, 23.5% of the women and 11.6% of the men reported any service use in the past 12 months. Service use depends on type of diagnosis, comorbidity and socio-demographic characteristics. Lowest 12-month utilization rates were found for substance use disorders (15.6%; lifetime use 37.3%), highest for psychotic disorders (40.5%; lifetime 72.1%). Further, a considerable time lap was found between disorder onset and subsequent service use among the majority of cases with anxiety and mood disorders. This paper provides self-reported epidemiological data on mental health service use in Germany, complementing administrative statistics and the predecessor mental health module of the German Health Interview and Examination Survey (GHS-MHS) from 1998. Despite considerable changes in the mental health field in Germany and the existence of a comprehensive mental health care system without major financial barriers, we find no indications of substantially higher utilization rates for mental disorders as compared to other comparable European countries. Further, no indications of major overall changes in utilization rates are apparent. To pinpoint areas with unmet needs, more detailed analyses of the data are needed taking into account type, frequency, and adequacy of service use and treatment of mental disorders. Appropriately matched comparisons with the GHS-MHS are needed to identify changes in patterns of utilization and interventions by type of disorder.

[Chronic somatic conditions and mental health problems in the general population in Germany. Results of the national telephone health interview survey "German health update (GEDA)" 2010]. / Chronische somatische Erkrankungen und Beeinträchtigung der psychischen Gesundheit bei Erwachsenen in Deutschland. Ergebnisse der bevölkerungsrepräsentativen Querschnittsstudie Gesundheit in Deutschland aktuell (GEDA) 2010.

OBJECTIVE: To assess the association of chronic somatic diseases and mental health problems in the general population in Germany. METHODS: The data (n = 22 050) derived from the representative cross-sectional telephone survey "Gesundheit in Deutschland aktuell (GEDA) 2010". It included self-reported information on diagnosis of 19 chronic physical conditions for at least 18-year-old people. Mental health problems encompass self-reported diagnosis of depression and recent mental distress according to the Mental Health Inventory (MHI-5). Age-specific adjusted logistic regressions were calculated. RESULTS: There was an association of chronic physical illness and mental health problems in all age groups. In 18 - 44 and 45 - 64-year-olds the association got stronger with each additional chronic disease. In all age groups mental health problems were most common in multimorbid subjects. CONCLUSION: Comorbid mental health problems should be accounted for particularly in multimorbid subjects of all ages. In younger patients mental health problems should be considered even if only one chronic disease is present.