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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Alcohol Clin Exp Res. 2010 Nov 12;35(2):295–303. doi: 10.1111/j.1530-0277.2010.01345.x

Table 1. Group Differences in Impulsive Behavior, Adolescent Drinking, and Late Adolescent and Young Adult Alcohol Use Disorders.

Trajectory Group
Low Adolescence-Limited Moderate High
Mean impulsive behavior score ages 9-17 0.17 (SD=0.37) 0.49 (SD=0.46) 0.88 (SD=0.55) 1.55 (SD=0.54)
Percent drinking heavily by age 17 31.4% 31.9% 41.6% 57.6%
Mean peak BAC by age 17 .05% .06% .08% .10%
Mean age of onset of heavy drinking among boys who drank heavily by age 17 14.7 (SD=1.7) 14.4 (SD=1.9) 14.6 (SD=1.9) 14.8 (SD=1.1)
Mean age of onset of drinking among boys who drank heavily by age 17 13.1 (SD=3.2) 11.9 (SD=2.7) 11.8 (SD=3.1) 10.8 (SD=3.3)
% AUD at approx. age 18 6.6% 9.6% 15.1% 20.7%
% AUD at approx. age 24/25 26.2% 37.7% 45.2% 41.9%
% DEP at approx. age 18 0.00% 1.20% 4.38% 10.34%
% DEP at approx. age 24/25 6.56% 9.52% 11.07% 13.79%

AL=Adolescence-Limited; Mod=Moderate; BAC=Blood Alcohol Concentration; AUD=Alcohol Use Disorder (abuse or dependence); DEP=Alcohol Dependence (probable or definite); approx.=approximate; SD= standard deviation.