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A cross-sectional survey of students designed to be representative of the nation's middle- and high-school studentsA cross-sectional survey is one given a point in time to a "cross section" of the populationThis survey asks about risky behaviors--particularly alcohol, cigarette and drug useGiven annually, it provides trends as to what is staying the same or changing regarding substance abuse among 8th, 10th and 12th graders
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