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. Author manuscript; available in PMC: 2011 Mar 1.
Published in final edited form as: Addict Behav. 2009 Oct 22;35(3):183. doi: 10.1016/j.addbeh.2009.10.012

Table 2.

Between-groups effect sizes between assessment-only controls, e-Chug, and AlcoholEdu conditions

Control Vs.
 e-Chug Vs.
e-Chug AlcoholEdu AlcoholEdu
Typical drinks/drinking occasion, past month .61 .75 .07
Peak drinks/drinking occasion, past month .60 .68 .03
Ave. no. of drinks/week, past month .85 .68 −.11
No. heavy drinking episodes, past
   month		 .54 .63 .13
Estimated typical BAC, past month .60 .59 −.02
Peak estimated BAC, past month .69 .69 .01
No. negative alcohol consequences, past
   month		 .34 .56 .20

Note. Cohen’s d was calculated using estimated means (adjusted for gender and baseline values of the dependent variable) with pooled standard deviations. A positive effect size indicated a mean decrease in behaviors for the comparison group (AlcoholEdu or e-Chug) relative to the reference group (Control or e-Chug), and a negative effect size indicated a mean increase in behaviors for the comparison group relative to the reference group.