TABLE 1.

Preintervention Sample Characteristics for Population and Selected Evaluation Subsample Groups

Variable	RCT Population Versus Selected and Interviewed Evaluation Subsamples			Interviewed Intervention Versus Control Evaluation Subsamples
	RCT Population (n = 4777)	Selected Evaluation Subsample (n = 664)	Participating Evaluation Subsample (n = 531)	Participating Intervention Subsample (n = 260)	Participating Control Subsample (n = 271)
% Participation of selected			80.0	81.3	78.8
Infant birth risk
% Low birth wt	10.0	9.1	8.9	7.8	10.0
% Gestation <37 wk	8.2	6.7	6.3	4.7	7.8
% Any birth complications	7.4	5.8	6.1	3.9	8.1*
% Medicaid or no insurance	60.8	63.1	65.5*	63.3	67.5
Mother’s age (mean, y)	28.5	28.5	28.3	28.2	28.4
Mother’s race or ethnicity
%White, non-Hispanic	29.7	29.2	26.6	28.5	24.7
% Black	36.7	38.0	39.4	36.5	42.1
% Hispanic	22.6	23.2	24.7	25.0	24.4
% Other	11.1	9.6	9.4	10.0	9.9
% Infant female	49.8	54.7**	53.5	50.8	56.1

Column 2 is contrasted with column 1; column 3 is contrasted with column 1; column 5 is contrasted with column 4. *P < .05; **P < .01.