A program on the intervention trial of stroke risk factors has been carried out in 7 cities of China in which an epidemiolog-ical survey of cerebrovascular disease was completed in 1985. 7 medical centers joined in this project. The study is a primary prevention to test the effect of multifactor intervention-consisting of drug and non-drug therapy for hypertension and health education to and enhance self-care of whole community population-on the incidence and mortality of stroke. Based on the baseline surve...