Table 2.

ACCESS participant characteristics

	All (n=765)		Girls (n=375)		Boys(n=390)
Categorical Variables	n	%	n	%	n	%
Asthma by age 6 years *
No	627	82.0	319	85.1	308	79.0
Yes	138	18.0	56	14.9	82	21.0
Season of birth
Winter	205	26.8	114	30.4	91	23.3
Spring	179	23.4	75	20.0	104	26.7
Summer	164	21.4	71	18.9	93	23.9
Fall	217	28.4	115	30.7	102	26.2
Maternal Race
Hispanic	412	53.9	216	57.6	196	50.3
Black	221	28.9	100	26.7	121	31.0
White/Other	132	17.3	59	15.7	73	18.7
Maternal education
>12 yrs	252	32.9	121	32.3	131	33.6
≤12 yrs	513	67.1	254	67.7	259	66.4
Maternal atopy †	275	36.0	136	36.3	139	35.6
Tobacco Smoke Exposure
Never smoke exposed	512	66.9	250	66.7	262	67.2
Pre- and/or postnatal exposure ∫	253	33.1	125	33.3	128	32.8
Continuous Variables
Prenatal NLEs (range 0–11; median, IQR) ‡	2	1–4	2	1–4	2	1–4
Postnatal NLEs (range 0–11; median, IQR) ‡	2	1–3	2	1–3	2	1–3
Maternal age at enrollment (years; mean, SD)	26.8	5.9	26.8	5.8	26.8	6.0
Maternal body mass index (BMI) (kg/m2; mean, SD)	28.9	6.6	29.3	6.9	28.6	6.3
Neighborhood disadvantage; z-score (median, IQR)	0.25	−0.50–0.54	0.32	−0.30–0.55	0.15	−0.60–0.52
Prenatal black carbon (BC) level (μg/m3; median, IQR)	0.37	0.29–0.49	0.39	0.30–0.50	0.35	0.29–0.47
Bla g 1 (U/g; median, IQR)	0.20	0.2–0.4	0.20	0.2–0.4	0.20	0.2–0.4
Bla g 2 (U/g; median, IQR)	0.50	0.5–0.95	0.50	0.5–0.75	0.50	0.5–1.0
Gestational age at birth (weeks; mean, SD)	39.1	2.9	39.2	3.5	38.9	2.2
Birthweight percentile for gestational age (mean, SD)	46.0	30.0	43.8	29.8	48.1	30.2

^*Clinician diagnosed asthma

^†Maternal-reported doctor-diagnosed asthma, eczema, and/or hay fever,

^‡Negative life events assessed using the Crisis in Family Systems-Revised (CRISYS-R) survey³⁴, a multi-item survey summarized into a continuous score,

^∫Denotes prenatal maternal smoking or postnatal smoking in household by mother and/or others