Screen-detected diabetes, hypertension and hypercholesterolemia as predictors of cardiovascular mortality in five populations of Asian origin: the DECODA study

Background The World Health Organization (WHO) predicts that the Asia Pacific region will experience an increase in cardiovascular disease (CVD) as a result of demographic changes and an increasing prevalence of diabetes. The aims of this study were to assess the predictive value of glucose tolerance status as a risk factor for CVD and identify a high-risk group for fatal CVD in population-based studies of Asians. Design A meta-analysis of five prospective cohort studies of Japanese and Asian Indian origin from five countries. Methods A total of 6573 subjects without a history of CVD from five prospective studies were followed for 5-10 years. Diabetes at baseline was diagnosed according to 1999 WHO criteria. Hazard ratios for death from CVD were estimated using a Cox proportional hazard model, adjusting for glucose tolerance status together with established risk factors for CVD. Results The meta-analysis showed that the overall hazard ratios (95% confidence interval) for CVD mortality corresponding to the presence of screen-detected diabetes, hypertension and hypercholesteremia were 3.42 (2.23-5.23), 1.57 (1.10-2.24) and 1.49 (1.05-2.10), respectively. Stratified multivariate analysis of the pooled data showed that subjects with screen-detected diabetes in the presence of hypertension or hypercholesteremia had the highest risk of CVD in individuals without previous CVD or diabetes. Subjects with screen-detected diabetes in the presence of hypertension or hypercholesteremia comprised 78% of CVD deaths that occurred in all subjects with screen-detected diabetes. Conclusions The early detection of undiagnosed diabetes in hypertension or hypercholesteremia may have clinical and public health implications for the primary prevention of rapidly increasing diabetes-related atherosclerotic CVD in Asian populations.