Table 1.

Mean Scores for Self- and Friend-Reported Internalizing and Externalizing Adjustment and for Positive Friendship Quality and Self-Disclosure for the Entire Sample and by Gender

	Total sample M (SD)	Girls M (SD)	Boys M (SD)	t value
Self-reported internalizing	13.36 (8.62)	15.36 (9.10)	10.42 (6.89)	4.22***
Self-reported externalizing	12.12 (7.68)	10.78 (6.76)	14.08 (8.52)	2.05*
Friend-reported internalizing	8.80 (8.21)	9.91 (7.64)	7.15 (8.78)	3.19**
Friend-reported externalizing	10.74 (9.18)	10.24 (7.81)	11.48 (10.90)	0.97
Positive friendship quality	3.60 (0.94)	3.85 (0.84)	3.20 (0.96)	3.96***
Self-disclosure (whole sample)	3.65 (1.20)	4.16 (0.90)	2.90 (1.19)	7.22***
Grade 5	3.23 (1.28)	3.68 (1.17)	2.64 (1.20)	2.60*
Grade 8	3.71 (1.30)	4.34 (0.74)	2.35 (1.21)	6.69***
Grade 11	3.96 (0.88)	4.36 (0.64)	3.49 (0.91)	4.47***

^*p<0.05,

^**p<0.01,

^***p<0.0001