Table 2. Mean scores of behavior problems and parent-child interactions at the initial assessment, 6-month assessment and 18-month follow-up; ECBI, CBCL, Parental Do and Don’t Skills and Child Non-Compliance.

		Initial		6-month		Change from T1 to T2.		18-month.		Change from T1 to T3
		assessment (T1)		assessment (T2)				follow-up (T3)
		M	SD	M	SD	Wald (p-value)	Hedges'g	M	SD	Wald (p-value)	Hedges' g
ECBI Intensity—Mother	PCIT	147.87	20.58	122.65	11.51	21.01 (< .001)	1.49	120.50	30.82	13.39 (< .0001)	1.04
	TAU	155.13	24.25	132.38	32.78	8.39 (.004)	.79	136.21	29.80	8.44 (.004)	.70
ECBI Intensity—Father	PCIT	140.18	21.48	115.08	18.83	27.05 (< .001)	1.22	110.75	21.95	21.54 (< .0001)	1.34
	TAU	140.83	21.79	126.48	24.87	6.64 (0.1)	.61	121.18	30.48	15.24 (.0001)	.74
CBCL Externalizing -	PCIT	26.42	9.23	16.04	9.78	26.70 (< .001)	1.08	17.00	11.08	31.65 (< .0001)	.91
Mother	TAU	24.78	10.16	19.17	11.89	5.74 (0.17)	51	20.04	14.00	4.51 (.03)	.39
CBCL Externalizing -	PCIT	23.93	9.79	14.61	5.81	24.17 (< .001)	1.12	15.03	9.72	18.26 (< .0001)	.90
Father	TAU	20.70	9.43	16.59	9.44	4.61 (.03)	.43	15.65	11.45	8.94 (.003)	.48
Parental Do Skills	PCIT	4.43	3.35	16.34	7.43	55.19 (< .001)	-2.10	14.76	7.53	42.30 (< .0001)	-1.81
	TAU	6.02	3.51	5.44	3.09	.28 (.60)	.17	4.33	2.48	4.34 (.04)	.54
Parental Don’t Skills	PCIT	20.26	7.57	13.33	6.56	15.54 (< .001)	.96	10.09	3.37	30.04 (< .0001)	1.66
	TAU	21.27	6.68	22.42	5.43	.35 (.55)	-.18	16.22	6.89	6.76 (.009)	.74
Child Non-Compliance	PCIT	3.59	2.51	2.71	2.64	1.42	.34	2.12	3.33	3.16 (.07)	.50
	TAU	5.00	5.70	2.47	1.70	4.74	.55	3.78	5.72	.62 (.43)	.21

Note: ECBI = Eyberg Child Behavior Inventory, CBCL = Child Behavior Check list, PCIT = Parent-Child Interaction Therapy, TAU = treatment as usual, CI = confidence interval, T1 = initial assessment, T2 = 6-month assessment, T3 = 18-month follow-up.