Using the Youth Risk Behavior Survey (2009),researchers surveyed students in grades 9-12 and found that the percentage of students reporting having had sexual intercourse before the age of 13 was

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The Youth Risk Behavior Survey (2009) reported that 6% of students in grades 9-12 had sexual intercourse before the age of 13.

Using the Youth Risk Behavior Survey (2009),researchers Surveyed Students in Grades