Subgrouping of risky behaviors among Iranian college students: a latent class analysis.

Based on Monitoring the Future study, last year prevalence of methamphetamine use among college students followed a decreasing trend, changing from 3.3% in 1999 to 0.5% in 2008. 26 Two studies on Iranian college students found that last year prevalence of methamphetamine use ranged from 1% to 8.8%. 29 , 30 In the present study, last year prevalence of methylphenidate use was reported by 2.5% of students and its prevalence was threefold in males compared to females (4.1% vs 1.4%).

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