The following studies provide the evidence used in this tool:

Equation for Calculation of Total CHD events (angina, MI, CHD death):

Wilson PW, D'Agostino RB, Levy D, Belanger AM, Silbershatz H, Kannel WB. Prediction of coronary heart disease using risk factor categories. Circulation. 1998;97:1837-47.

Relative Risk Reductions for Primary Prevention Strategies:

Hayden M, Pignone M, Phillips C, Mulrow C. Aspirin for the primary prevention of cardiovascular events: a summary of the evidence for the U.S. Preventive Services Task Force. Ann Intern Med. 2002;136:161-72.

Pignone M, Phillips C, Mulrow C. Use of lipid lowering drugs for primary prevention of coronary heart disease: meta-analysis of randomised trials. BMJ. 2000;321:983-6.

Office of the Surgeon General. The Health Benefits of Smoking Cessation: A Report of the Surgeon General. 90. Washington, DC, US Department of Health and Human Services, Public Health Service and Centers for Disease Control.

Sheridan S, Pignone M, Donahue K. Screening for high blood pressure: a review of the evidence for the U.S. Preventive Services Task Force. Am J Prev Med. 2003;25:151-8.

To learn more about CHD risk calculators and why different tools provide you with slightly different risk estimates, you might also consider the following paper:

Sheridan S, Pignone M, Mulrow C. Framingham-based tools to calculate the global risk of coronary heart disease: a systematic review of tools for clinicians. J Gen Intern Med. 2003;18:1039-52.