LITERACY 286,320 Literacy among youths 12-17 years, United States, Prevalence of illiteracy as measure 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 Servic 4° s. IV, 28. Vital and Health Statistics Data from the National Health Survey Ser. 11, no 131.