Table 1.

Descriptive Data for Behavior Problems by Sex

Replicate 1	Girls			Boys			Sex difference effect size
	Mean (SD)	Range	N	Mean (SD)	Range	N	d
Externalizing problems	5.88 (7.09)	0–59.00	290	7.05 (8.03)	0–44.00	289	−.15†
Internalizing problems	6.30 (6.75)	0–40.00	290	5.07 (5.56)	0–25.00	289	.20*
Depression	1.51 (.44)	1.00–3.35	250	1.42 (.34)	1.00–2.85	244	.23**
Drug symptom counts	.06 (1.10)	−.93–6.26	315	.03 (1.15)	−1.14–4.91	307	.03
Conduct disorder	1.73 (2.48)	0–18.00	320	3.18 (3.55)	0–18.00	321	−.47***
Age at first sex	16.60 (2.45)	11.00–26.00	192	16.57 (2.02)	11.00–23.00	190	.01

Replicate 2	Girls			Boys			Sex difference effect size
	Mean (SD)	Range	N	Mean (SD)	Range	N	d
Externalizing problems	6.60 (7.14)	0–44.00	284	8.24 (8.95)	0–64.00	287	−.20*
Internalizing problems	6.64 (6.35)	0–29.00	284	5.32 (5.98)	0–36.00	287	.21*
Depression	1.50 (.38)	1.00–3.15	246	1.48 (.38)	1.00–2.75	225	.05
Drug symptom counts	.07 (1.15)	−.94–4.78	307	.14 (1.20)	−1.04–5.68	296	−.06
Conduct disorder	1.69 (2.24)	0–13.00	313	3.07 (3.45)	0–21.00	320	−.47***
Age at first sex	16.58 (2.19)	12.00–24.00	171	16.35 (1.99)	11.00–24.00	191	.11

Note. Sex differences tested by independent samples t-test,

^†p< .10,

^*p< .05,

^**p< .01,

^***p< .001.