Large-scale cohort studies in mental health research - strengths and limitations.

In recent years, the use of longitudinal studies in mental health research has grown, particularly in the United Kingdom. These studies provide numerous benefits and improvements in mental health research, such as facilitating the early detection of risk factors for mental health problems. Nevertheless, they also come with drawbacks, including their high financial costs and the complexity involved in their implementation. Although significant efforts have been made in the United Kingdom to fund large longitudinal cohorts for mental health research, most existing longitudinal cohort studies tend to cover a broad range of factors across large sample sizes, often providing only limited information on each individual factor. To address this, future longitudinal studies should prioritise more focused and in-depth evaluations of key variables and mechanisms, rather than broad but less detailed assessments. In other words, it is essential that future longitudinal studies are specifically designed to test well-defined hypotheses. Overall, this could play a major role in guiding the design of more precise and effective early interventions for mental health.