TABLE 3.

Multilevel growth curve models predicting child’s inattentive ADHD symptom severity over time.

	Estimate (effect size)	Standard error	P-value	Sig.
Common
State (PA = 0, NC = 1)	−0.051	0.050	0.308
Sex (Female = 0, Male = 1)	0.342	0.041	0.000	***
Race	0.100	0.055	0.071
Age (cntrd)	0.072	0.012	0.000	***
Age squared	−0.022	0.003	0.000	***
Primary-caregiver COMT (Met = 0/Val-Val = 1)	0.006	0.052	0.910
Primary-caregiver ADHDHyper-Imp	0.027	0.029	0.362
Primary-caregiver ADHDInatt	−0.008	0.033	0.819
Positive caregiving	−0.090	0.027	0.001	***
Early childhood
(Intercept)	0.972	0.042	0.000	***
COMT (Met = 0/Val-Val = 1)	−0.071	0.069	0.298
Negative caregiving	0.088	0.027	0.001	**
SES-risk	0.060	0.030	0.047	*
Negative caregiving × COMT	−0.078	0.057	0.173
SES-risk × COMT	−0.064	0.061	0.296
Middle childhood
(Intercept)	0.897	0.038	0.000	***
COMT (Met = 0/Val-Val = 1)	−0.148	0.073	0.043	*
Negative caregiving	0.090	0.030	0.003	**
SES-risk	0.132	0.032	0.000	***
Negative caregiving × COMT	0.069	0.062	0.266
SES-risk × COMT	−0.146	0.066	0.026	*

Multilevel regression results: estimated effect sizes are organized into common, early and middle childhood. Variance components are not given. See text for details. * P < 0.05, ** P < 0.01, *** P < 0.001.