PREVIOUS REPORTS a method was described for the detection of heart disease in large populations of school children by a tape-recording system in a mobile trailer. Re- sults were presented of the first mass field trial, accomplished in Chicago public elemen- tary school children." 2 Since the presentation of these reports two additional research and developmental studies have been done, with semiportable equipment but without a trailer. The first surveyed the elementary and junior high school population in Michigan City, In- diana; the second, Chicago area high school students. The results of these investigations are reported in this and the subsequent paper.
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Miller et al. (1965) studied this question.
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