Table 2.

Sample characteristics

Infant	Cocaine (n=158)		Non-cocaine (n=161)		t/χ2	p
	M±SD	Range	M±SD	Range
Birthweight (g)a	2738±642	(905–3995)	3112±629	(1017–4515)	18.8	0.0001
Gestational age (weeks)	37.8±3	(28–42)	38.7±2	(30–42)	3.2	0.001
Birth lengtha	47.4±4	(34–58)	49.3±3	(37–57)	11.7	0.0007
Head circumferencea (cm)	32.4±2	(23–37)	33.6±2	(25–39.5)	15.8	0.0001
Apgar — 1 min (cm)	8.0±1	(1–9)	8.0±2	(1–9)	−0.37	0.70
Apgar — 5 min	8.8±6	(5–9)	8.8±0.6	(5–9)	0.30	0.77
Hobel risk score	6.0±14	(0–85)	4.1±11	(0–65)	−1.4	0.17
Female	82 (52%)		80 (50%)		0.16	0.70
SGAb	19 (12%)		2 (1%)		18.1	0.001
Microcephaly	40 (26%)		14 (9%)		15.9	0.001
Non-maternal care	45 (29%)		1 (<1%)		50.1	0.001

^ap adjusted for gestational age.

^bSmall for gestational age.