Hours worked per week by school-enrolled 16 year-olds in the week prior to the interview, National Longitudinal Survey of Youth (NLSY), 1997, by race or Hispanic origin Whites Blacks Hispanics 0 hours 55.0% 75.5% 70.3% 20 or fewer hours 32.7% 18.3% 21.7% 21 or more hours 12.3% 6.2% 8.0% Total 0 hours 61.6% 20 or fewer hours 27.9% 21 or more hours 10.5%