. Author manuscript; available in PMC: 2010 Aug 1.

Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2009 Aug;48(8):820–827. doi: 10.1097/CHI.0b013e3181aa0383

Table 2.

Means (and Standard Deviations) by Drinking Onset Group for Aggression and Delinquent Behavior

Variable	Wave	NonEFD	EFD	t
		M (SD)	M (SD)
Aggression	1	10.47 (5.57)	11.20 (5.51)	−0.85
	2	8.61 (5.14)	10.15 (5.40)	−1.90
	3	8.21 (5.69)	8.31 (5.87)	−0.11
	4	6.58 (5.12)	8.47 (5.96)	−2.27^*
Delinquent Behavior	1	1.67 (1.28)	2.53 (1.96)	−3.75^**
	2	1.76 (1.32)	2.96 (1.99)	−5.01^***
	3	1.57 (1.43)	1.99 (1.96)	−1.72
	4	1.45 (1.77)	3.05 (2.70)	−5.00^***

Note. Degrees of freedom were 218 for all tests. The same pattern of significance was found when equal variances were not assumed. EFD = Early First Drinking

p < .05

^**

p < .01

^***

p < .001