New information is presented in this report on recent changes in rates of school participation in the United States by age, sex, marital status, race, and income, and changes in field of study of college students. Included also for the first time is information on the enrollment status of persons 35 years old and over, and on the enrollment level of persons of Spanish origin. The information derives from a supplement to the Census Bureau's October 1972 Current Population Survey and refers to the civilian noninstitutional population. Content is divided into chapters on enrollment level, related reports, definitions and explanations, and source and reliability of the estimates. The remainder of the report consists of 4 charts, 14 text tables, and 19 detailed tables. Appendixes contain tables showing the percent enrolled in school by age, race, and sex for October 1960 to October 1972 and the school enrollment by level for October 1971 and by single years of age. (Author/KSM)