General population longitudinal studies of mental disorders in children: a systematic review of study characteristics

Longitudinal studies of mental disorders in children examine risk factors, outcomes, and sequelae of disorder. They are resource intensive but allow for causal inferences and life-course perspectives. The objectives, methodology, and operational characteristics of general population longitudinal studies of mental disorders in children are highly variable. Understanding the characteristics of existing studies is needed for deliberate and strategic planning of new longitudinal studies that maximize the value of research investments and address evidence gaps.