This longitudinal study followed a previously studied cohort. Detailed baseline data collected in 1973-1978 were available. In phase I of the study, the life/death status of all 1,085 subjects was ascertained up to January 1, 1986. Death certificates were obtained and cause of death analyzed. For the survivors, a personal interview and physical examination were performed in Phase II. Occurrence of specified diabetes-related vascular complications was documented. The detailed follow-up questionnaire included all the data required for the WHO Multinational Study of Vascular Disease in Diabetes plus specific information related to this population. Analysis was conducted on overall mortality rates, disease-specific mortality rates, and survival time. Prevalence and incidence of morbidity from micro- and macrovascular complications were estimated. The extent to which selected risk factors were associated with or could predict the development of vascular diseases was examined. The results of the analyses were compared with those obtained in the WHO Multinational Study.