The study involved 454 health professionals ages 40 to 75 who had suffered a nonfatal heart attack or died of heart disease, as well as 900 other men with no history of cardiovascular disease.

• 该项目研究了454位曾经患过非致命性心脏病或死于心脏病的健康职业人士，他们年龄介于40-75岁间，同时还研究了900位没有心脏病史的人。