| Description | The study aimed to determine the interests and activities that influence the health of middle aged civil servants, aged between 40 and 54 that led to the 'Vigorous Exercise in Leisure- Time and the Incidence of Coronary Heart-Disease'. A follow up study was conducted in 1976. Papers contain blank questionnaires, correspondence providing instructions to the participants, an instruction manual for coding the completed questionnaires, and two completed questionnaires that includes personal information. |