VITAL AND HEALTH STATISTICS. DATA FROM THE NATIONAL HEALTH SURVEY Ser.11, no. 131. 286,320 LITERACY Literacy among youths 12-17 years, United States. Prevalence of illiteracy as measured by the Brief Test of Literacy among youths by selected socioeconomics and demographic variables. Rockville 1973 U.S. Department of Health, Education, and Welfare Public Health Service 4° s. IV, 28. Vital and Health Statistics Data from the National Health Survey Ser. 11, -o 1 3 1 .