TABLE 1.

Descriptive Characteristics for the Overall Sample and Subgroups Defined by Pubertal Timing and Race/Ethnicity

	Overall	Pubertal Timing		Race/Ethnicity
		Early	Not Early	Hispanic	Black	Other	White
Age at wave 1, mean (SD), y	11.10 (0.57)	11.11	11.12	11.10	11.12	11.00	11.12
Family SES, mean (SD)	−0.16 (0.92)	−0.44***	−0.13	−0.64***	−0.21***	0.50**	0.79
Single-parent family, %	6	6	6	3	11***	7	4
Two parents, %	66	61	66	75*	40***	70*	81
Early maturation, %	15	100	0	17***	19***	15**	6
Best friend’s deviance, mean (SD)	0.73 (1.13)	0.79	0.71	0.82***	0.75**	0.69	0.52
Delinquency, mean (SD)a
Age 11 years	0.61 (1.03)	0.87***	0.57	0.37	1.19***	0.57*	0.35
Age 13 years	0.63 (1.13)	1.04***	0.56	0.67***	0.93***	0.34	0.19
Age 16 years	0.67 (1.15)	0.82**	0.65	0.74***	0.87***	0.45	0.29
Physical aggression, mean (SD)b
Age 11 years	0.95 (1.67)	1.23***	0.91	0.83	1.40***	0.99*	0.61
Age 13 years	1.50 (2.41)	2.02***	1.41	1.53***	2.12***	1.16	0.62
Age 16 years	1.60 (2.47)	1.65	1.61	1.50***	2.39***	0.97	0.83
Relational aggression, mean (SD)c
Age 11 years	1.00 (1.69)	1.21*	0.97	0.93*	1.35***	1.08*	0.64
Age 13 years	1.20 (1.90)	1.45*	1.16	1.15	1.48***	1.31	0.90
Age 16 years	1.12 (1.54)	1.07	1.14	0.88***	1.39*	1.28	1.23
Nonphysical aggression, mean (SD)d
Age 11 years	1.19 (1.69)	1.40*	1.16	1.10	1.52***	1.18	0.92
Age 13 years	1.60 (2.24)	2.01***	1.54	1.67***	1.93***	1.27	1.05
Age 16 years	1.96 (2.29)	2.01	1.97	1.81	2.35***	1.69	1.80

^aDelinquency ranged from 0 (none) to 6 delinquent acts; means correspond to <1 delinquent act.

^bPhysical Aggression ranged from 0 (none) to 19 (each aggressive behavior ≥ 6 times last month).

^cRelational Aggression ranged from 0 (none) to 18 (each aggressive behavior ≥ 6 times last month).

^dNonphysical Aggression ranged from 0 (none) to 15 (each aggressive behavior ≥ 6 times last month). Means for each aggression scale correspond to engaging in each aggressive behavior 1 to 2 times in last month (1) to 3 to 5 times per month (2).

*P < .05, **P < .01, ***P < .001.