Primary prevention of coronary heart disease is most appropriate for patients at relatively high risk. Measurement of coronary artery calcium has been proposed as a way to improve risk assessment, but it is unknown whether it adds predictive information to standard risk factor assessment.
Department of Epidemiology and Biostatistics, University of California, San Francisco, 500 Parnassus Ave, MU 420 West, Box 0560, San Francisco, CA 94143, USA. mpletcher@epi.ucsf.edu
