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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Drug Alcohol Depend. 2014 Aug 12;143:213–218. doi: 10.1016/j.drugalcdep.2014.07.032

Table 1.

Ages at assessments

Statistics Visits
1 2 3 4 5 6
N 225 181 170 165 117 57
Mean 11.5 13.7 16.2 19.0 22.0 24.8
SE .06 .06 .03 .03 .03 .03
Median 11.6 13.8 16.1 18.8 21.8 24.7
Range 9.6–13.0 11.9–15.2 15.6–17.4 18.2–20.0 21.6–23.0 24.6–26.0