First, the researchers used data from a large ongoing study in Framingham, Massachusetts, to find the 10-year rates of CHD events among white adults with different levels of 5 risk factors. They defined CHD events as heart attacks or death from CHD. They categorized each adult's blood pressure, low-density lipoprotein cholesterol level, high-density lipoprotein cholesterol level, glucose level, and smoking status as optimal (normal or absent), borderline (suboptimal but not clearly abnormal), or high (clearly abnormal). Second, the researchers used data from a national survey and the 2000 U.S. Census to find numbers of white non-Hispanic adults in the United States with the various levels of the 5 risk factors. Third, the researchers applied the CHD event rates from the Framingham Study to the survey data so that they could estimate the fractions of CHD events in white non-Hispanic persons in the United States arising from the different levels of risk factors.