Table 3.

Results for Intervention Effects

Outcome	B	SE	Effect size
Sibling relationship
Fair play (M)	0.15*	0.06	0.34
Fair play (F)	0.03	0.08	---
Sibling intimacy (C)	0.07	0.09	---
Sibling conflict (C)	0.13	0.08	---
Sibling negativity (O)	0.01	0.10	---
Sibling positivity (O)	0.28*	0.13	0.32
Rule break approval (O)a	0.41	0.82	---
Child adjustment
Externalizing (M)	−0.59	0.41	---
Externalizing (F)	0.01	0.59	---
Internalizing (M)	−0.55*	0.22	0.31
Internalizing (F)	−0.32	0.33	---
Self-control (M)	0.12*	0.06	0.24
Self-control (F)	0.14*	0.07	0.29
Social competence (T)	0.22**	0.08	0.32
Academic performance (T)	0.08*	0.04	0.24
Parenting
Authoritarian control (M)	−0.07	0.09	---
Authoritarian control (F)	−0.15	0.11	---
Positive guidance (M)	0.07	0.09	---
Positive guidance (F)	−0.10	0.09	---
Noninvolvement (M)	0.19*	0.09	0.27
Noninvolvement (F)	0.19*	0.09	0.29
Depressive symptoms (M)	−0.10**	0.03	0.23
Depressive symptoms (F)	−0.03	0.04	---

Note. (M) = mother-reported; (F) = father-reported; (T) = teacher-reported; (C) = child-reported; (O) = observed.

^aLog-odds coefficient from multi-level logistic regression.

^*p < .05.

^**p < .01.