Table 2.

Attrition analysis of baseline data for study completers versus families missing at the 2-year follow-up

Baseline variables	KOMET			KOMET + CPP
	Completersa (n = 31)	Missingb (n = 24)	p-value c	Completersa (n = 52)	Missingb (n = 11)	p-value c
Girls (%)	16.1%	41.7%	.035*	23.1%	27.3%	.714
Higher Education (%)	58.1%	37.5%	.130	51.9%	18.2%	.052
ODD risk (%)	19.4%	25.0%	.615	21.2%	36.4%	.435
DBD-ODD (Mean (SD))	12.5 (3.5)	15.8 (5.0)	.008**	13.6 (4.0)	15.5 (3.4)	.113
SDQ prosocial (Mean (SD))	6.0 (2.0)	6.1 (1.9)	.815	5.8 (2.1)	5.1 (1.0)	.100
P-COMP (Mean (SD))	30.6 (7.1)	25.3 (6.7)	.007**	28.0 (5.7)	25.1 (6.7)	.195
SSRS (Mean (SD))	49.2 (10.5)	45.0 (8.4)	.106	47.6 (10.7)	39.9 (7.5)	.011*
PSS (Mean (SD))	26.3 (5.2)	28.7 (5.7)	.118	28.4 (6.7)	30.6 (6.6)	.321
PPI Harsh (Mean (SD))	36.0 (9.4)	35.1 (11.5)	.752	30.8 (9.4)	38.5 (13.7)	.100
PPI Praise (Mean (SD))	34.2 (8.8)	39.0 (7.3)	.033*	35.2 (9.9)	37.5 (7.1)	.364

^aFamilies with data at the 24-month follow-up assessment

^b Families with missing data at the 24-month follow-up assessment

^cDifference between Completers and Missing. Welch two sample t-tests for continuous variables and Fisher’s Exact Test for categorical variables

*p < .05, **p < .01, Higher Education % = Proportion university level of education compared to elementary + high school level of education. ODD-risk % = Percentage children with severe ODD; DBD ODD = The Parent/Teacher Disruptive Behavior Disorder rating scale – Oppositional Defiant Disorder scale; P-COMP = Social Competence Scale- Parent; SSRS = Social Skills Rating System total scale; SDQ prosocial = Strengths and Difficulties Questionnaires Prosocial scale; PSS = Perceived Parental Stress; PPI Harsh = Parenting Practices Interview, Harsh and inconsistent discipline scale; PPI Praise = Parenting Practices Interview, Praise and incentives scale