Recruitment for the Coronary Primary Prevention Trial.

A preliminary account of some aspects of recruitment for the Coronary Primary Prevention Trial is provided. Extension of recruitment sources to include various forms of community screening resulted in more rapid acquisition of potential participants than was possible when recruitment was restricted to the more traditional sources of physician and laboratory referral. Extended recruitment was supported by augmented data feedback and by the development of the job of recruitment coordinator at each participating clinic. The identification of delays in reaching the maximal recruitment rate from particular sources points to the need for detailed planning of a recruitment campaign before large-scale clinical trials are begun.