title: A comparison between participants and non-participants in a primary preventive trial.
mesh_terms: D000367:Age Factors; D000437:Alcoholism / Q000150:complications; D001294:Attitude to Health; D003327:Coronary Disease / Q000453:epidemiology / Q000401:mortality / Q000517:prevention & control*; D003645:Death, Sudden; D004812:Epidemiologic Methods; D006760:Hospitalization; D006801:Humans; D008297:Male; D008875:Middle Aged; D009026:Mortality; D010352:Patient Dropouts; D013548:Sweden