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Table 4 The mean age of patients who used MA in starting groups

From: Investigating the sequential patterns of methamphetamine use initiation in Iran

First Substance Mean ± SD
Opium 18.06 ± 7.41
Methamphetamine 30 ± 14.93
Cannabis 16.54 ± 4.03
Heroin 19.83 ± 9.78
Alcohol 15.79 ± 4.92
Tobacco 15.25 ± 4.26