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U.S. youngsters aged 14 to 18 who work at retail and service jobs during the school year put in an average of 16 hours a week, often at jobs that are dangerous and unsupervised, a study said on Monday. The report from the University of North Carolina said some of the working conditions found in interviews with a representative sample of 928 teenage workers violated federal law. The research done during 2003 found the teens worked an average of 16.2 hours per week during the school year, including nearly three times a week after 7 p.m. on school nights. Thirty-seven percent of those under 16 reported working after 7 p.m. on a school night, a probable violation of federal law, it said.