Prevalence and Time Trends of Self-Reported Mental Health Problems Among Children and Adolescents Between 11 and 17 Years in the KiGGS Study.

Knowledge about the prevalence of mental disorders in childhood and adolescence is important for clinicians and policymakers. This study examines the prevalence and trends in self-reported mental health problems among 11- to 17-year-olds in Germany. We evaluated data from the self-report version of the Strength and Difficulties Questionnaire (SDQ) of 6,725 children and adolescents from the baseline of the German Health Interview and Examination Survey (KiGGS, 2003-2006) and 6,145 from its second wave (KiGGS wave 2, 2014-2017). According to the SDQ total difficulties score, the prevalence estimates did not vary significantly between the study waves, neither regarding the category "abnormal" (9.3 % vs. 9.4 %) nor the pooled categories "borderline/abnormal" (16.9 % vs. 15.4 %). We confirmed the results by linear regression analyses using mean values instead of the SDQ categories. Analyses of the SDQ subscales revealed gender and age-specific time trends. These findings differ from those based on the SDQ parent report, which suggests significant declines in symptom load between the study waves. The results indicate the importance of integrating youth self-reports when measuring mental health problems, at least as part of a multi-informant approach.