Relation of intensity and frequency of student drug use to reasons for use.
D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D007087:Illinois; D008297:Male; D012919:Social Behavior; D012959:Socioeconomic Factors; D013334:Students; D019966:Substance-Related Disorders / Q000209:etiology*; D011795:Surveys and Questionnaires