Figure 1.

Flow chart depicting the various stages of sample selection during various phases of Chennai Urban Rural Epidemiological Study (CURES). In phase 1 of the urban component of CURES, 26,001 individuals from 46 wards representing 10 zones of Chennai were recruited based on a systematic random sampling technique and fasting blood glucose was determined. In phase 2, detailed studies of diabetic complications, including nephropathy, neuropathy, and retinopathy were performed, and in phase 3, every 10th individual in phase 1 was invited to participate in more detailed studies, including screening for coronary artery disease. All participants for this study were recruited from phase 3 of CURES.