['To determine whether chronic medical conditions mediate the association between depression and cardiovascular disease (CVD) mortality.', "Data analyzed were from 6,394 subjects aged 25-74\xa0years who participated in extensive health examinations in the NHEFS conducted between 1971 and 1975 and follow-up studies to 1992. CVD mortality was the endpoint. Depression predictors were clinically significant depressive symptoms at baseline by the GWB-D, and/or at 1982-1984 by the CES-D ('baseline', 'new', or 'twice' depression). Chronic conditions were prevalent/incident high blood pressure, diabetes, and non-fatal CVD by examination and/or self-report. Mediation effects were assessed by stepwise adjustments of covariates and additive interactions in competing risks regression models (accounting for other mortality causes) and logit models.", 'Baseline, new, and twice depression were significant predictors of CVD mortality in competing-risks models adjusted for demographics (HRs 1.3, 1.4, and 2.0), but effects were progressively weakened and became non-significant after adjustment for lifestyle factors, prevalent and incident medical conditions, respectively. CVD mortality risk was 80% higher for depression plus incident non-fatal CVD than without (HR 4.0 vs. 3.2, additive interaction), and mediation effects of depression via chronic medical conditions (particularly via incident non-fatal CVD) increased the risk by 2-11% in logit models, independent of all covariates.'] Do chronic medical conditions mediate the association between depression and cardiovascular disease mortality?