191,756 REPORTING Reporting health events in household interviews: Effects of reinforcement,question length,and reinterviews. A methodological study designed to test the effectiveness of certain questionaire... Rockville 1972 U.S.Department of Health, Education,and Welfare,Public Health Service, 4° s. VIII, 70, ilustr. Vital and Health Statistics, ser.2, nr 45. Data Evaluation and Methods Research.