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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: J Consult Clin Psychol. 2011 Oct 17;79(6):740–750. doi: 10.1037/a0025949

Table 3.

Independent group t test results for study variables

Variables t-test Cohen’s d
Placement changes (T2 & T3) t = 2.45 (df = 97), p = .02 .50
Prosocial behavior (T2 & T3) t = -2.25 (df = 97), p = .03 .46
Internalizing/externalizing symptoms (T2 & T3) t = -.10 (df = 95), ns .02
Tobacco use (T5) t = 2.14 (df = 88), p =.04 .45
Alcohol use (T5) t = 1.12 (df = 88), ns .24
Marijuana use (T5) t = 2.69 (df = 88), p = .01 .57
Composite substance use (mean of tobacco, alcohol, and marijuana use at T5) t = 2.23 (df = 88), p = .03 .47
Delinquent behavior (T5) t = 1.67 (df = 88), p = .098 .36
Association with deviant peer (T5) t = 1.66 (df = 88), ns .35
Composite delinquency (mean of delinquent behavior and association with deviant peer at T5) t = 1.84 (df = 88), p = .07 .39