Saarinen A, et al. - This population-based longitudinal study was designed to examine whether depressive symptoms co-occurred with paranoid ideation from late adolescence to middle age and if depressive sub symptoms were differently linked with paranoid ideation in the general population. In addition, they explored whether depressive symptoms were associated with state-level or trait-level paranoid ideation among this population. They found an association between depressive symptoms and the course of paranoid ideation from late adolescence to middle age. Patients with paranoid ideation could merit from the evaluation of potential depressive symptoms, particularly in late adolescence and early adulthood. There could be a substantial need for neurocognitive rehabilitation and community-based treatments among patients with co-occurring depressive symptoms and paranoid ideation.