Table 1.

Means, standard deviations, and range values, as well as between-sex differences results for internalizing and externalizing problems, aggressive and victimization bullying behaviors, and social skills.

Variables	Total (N = 669)		Boys (n = 284)		Girls (n = 385)		Between-Sex Differences *
	M (SD)	Range	M (SD)	Range	M (SD)	Range	F(1667)	p	η 2
Internalizing problems	11.55 (6.06)	0.00–30.00	9.90 (5.67)	0.00–26.00	12.77 (6.07)	0.00–30.00	38.72	<0.001	0.055
Externalizing problems	8.37 (565)	0.00–36.00	9.01 (5.95)	0.00–36.00	7.89 (5.39)	0.00–36.00	6.46	0.011	0.010
Aggressive bullying behaviors	8.32 (2.47)	7.00–28.00	8.74 (2.74)	7.00–28.00	8.01 (2.20)	7.00–27.00	14.31	<0.001	0.021
Victimization bullying behaviors	9.38 (3.26)	7.00–28.00	9.36 (3.36)	7.00–28.00	9.39 (3.19)	7.00–28.00	0.02	0.886	<0.001
Communication skills	14.73 (3.03)	0.00–18.00	13.98 (3.40)	0.00–18.00	15.28 (2.59)	0.00–18.00	31.33	<0.001	0.045
Cooperation	15.67 (3.55)	0.00–21.00	14.75 (3.94)	0.00–21.00	16.34 (3.07)	0.00–21.00	34.51	<0.001	0.049
Assertiveness	11.67 (3.99)	0.00–21.00	11.46 (4.19)	0.00–21.00	11.83 (3.84)	0.00–21.00	1.39	0.240	0.002
Responsibility	16.81 (3.53)	0.00–21.00	15.86 (4.01)	0.00–21.00	17.51 (2.94)	0.00–21.00	37.66	<0.001	0.053
Empathy	14.29 (3.41)	0.00–18.00	13.14 (3.74)	0.00–18.00	15.13 (2.87)	0.00–18.00	60.93	<0.001	0.084
Engagement	14.36 (4.31)	0.00–21.00	14.07 (4.49)	0.00–21.00	14.58 (4.17)	0.00–21.00	2.36	0.125	0.004
Self-control	10.73 (3.71)	0.00–18.00	10.82 (3.98)	0.00–18.00	10.66 (3.51)	0.00–18.00	0.32	0.574	<0.001

Note. Values are reported for the total sample (N = 669), and for boys (n = 285) and for girls (n = 385), separately. * Data for univariate tests (Multivariate analysis, F(11,657) = 12.83, p < 0.001, partial η² = 0.177).