Table 3. Fixed Effects Logistic Regression Predicting Problem Behavior Composite (N=1,508 Adolescents from 655 Families).

Variable	Model 1				Model 2
	b	SE	OR	95% Confidence Interval	b	SE	OR	95% Confidence Interval
Middleborn	0.13	0.14	1.14	0.86-1.50	0.13	0.15	1.14	0.86-1.52
Lastborn	-0.17	0.15	0.85	0.63-1.14	-0.22	0.16	0.80	0.58-1.10
Age	0.05	0.05	1.06	0.95-1.17	0.04	0.05	1.04	0.93-1.15
Male	0.86 ***	0.13	2.36	1.82-3.05	0.80 ***	0.14	2.24	1.71-2.92
Twins	0.36	0.27	1.44	0.85-2.45	0.39	0.28	1.48	0.86-2.54
PVT					-0.06	0.09	0.94	0.78-1.13
GPA					-0.36 ***	0.09	0.70	0.59-0.83
Parental Presence					-0.04	0.02	0.96	0.92-1.01
Parental Closeness					-0.08 *	0.03	0.92	0.86-0.99

^*p<.05

^**p<.01

^***p<.001

Note: 1,121 Families or 2,294 Adolescents were dropped from the analyses due to lack of variation among siblings