Combined estimates of CHD across physical activity levels amongst participants with CHD risk factors defined by BMI, total cholesterol, hypertension (clinically and/or history), history of diabetes, and smoking status and with those without the risk factor and inactive as the reference group (REF). The model for each risk factor was adjusted for age at baseline, sex (stratification), centre (stratification), alcohol consumption, educational level, fruit intake, vegetable intake, and all the other risk factors.