TABLE 2.

Coefficients for the Difference Between Intervention and Control Groups Aged 21 Years at Follow-Up: Carolina Abecedarian Project, Chapel Hill, NC, 1972–1998

Measure	No. of Participants (n = 104)	Coefficienta	P
Health outcomes			.05
Depression index score	102	−3.12	.18
No health problems since age 15 y	102	0.62	.22
No hospitalizations in past y	100	1.1	.57
Behavioral risk factors			.03
Always wears seatbelt	100	0.38	.37
Never drinks and drives	99	−0.08	.88
Never rides with a drinker	99	0.01	.99
Has a primary care doctor	102	0.21	.63
Never used cocaine	71	−0.8	.44
Age began drinking	100	1.48	.17
Binge drinking	100	0.13	.73
Age began regular smoking	100	5.47	.02
Cigarettes smoked in past wk	100	−0.96	.26
Age first tried marijuana	100	3.73	.04
Marijuana use in past mo	100	−4.24	.06

Note. The intervention group was the baseline comparator. Variables were grouped into health outcomes and health behaviors. The outcome of interest was the joint test across each category. Coefficients were adjusted for mother's age at program entry, whether a father was in the household at childbirth, child's gender, and mother's years of education.

^aCompared with the control group.