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. Author manuscript; available in PMC: 2017 Aug 1.
Published in final edited form as: Dev Cogn Neurosci. 2016 Jun 17;20:35–42. doi: 10.1016/j.dcn.2016.06.002

Table 1.

Frequency of lifetime drug use in adolescents for the 3 substance use categories

Smoking
Alcohol
Marijuana
Age of substance use onset M F M F M F
Before 9 years old 0 0 2 0 0 0
9–10 years old 0 0 0 0 0 0
11–12 years old 0 0 0 1 0 0
13–14 years old 0 2 1 6 2 3
15–16 years old 1 2 2 5 1 3
17 years old or older 0 0 1 0 0 0

Total(%) 5(13.5) 18(48.7) 9(24.3)

Note. Smoking: more than one or two puffs; Alcohol: except for religious purpose; Marijuana: pot, weed, grass, hash; M= male, F=female