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. Author manuscript; available in PMC: 2011 Nov 1.
Published in final edited form as: Dev Psychol. 2010 Nov;46(6):1543–1555. doi: 10.1037/a0020549

Table 2.

Drug Use Onset by Grade

Grade % First Use Cumulative % Used % Missing
7 18.5 18.5 15.7
8 12.9 29.8 24.2
9 19.0 43.1 26.3
10 14.8 51.5 32.6
11 18.3 60.4 34.4
12 16.0 66.7 35.7

N = 754.