Table 1. Characteristics of pregnant women and infants within TIDES cohort (n=758).

Characteristic	No.a	%	Mean (SD)
Maternal age (years)			31.1 (5.5)
≤20	23	3.03
21-30	275	36.28
31-40	423	55.80
>40	33	4.35
Study center
San Francisco, CA	187	24.67
Minneapolis, MN	206	27.18
Rochester, NY	213	28.10
Seattle, WA	152	20.05
Race/ethnicity
White	500	65.96
Hispanic/Latina	87	11.48
Asian	67	8.84
Black/African American	48	6.33
Other	56	7.39
Education
High school or some college	57	7.52
Tech. school or college/tech. school graduate	135	17.81
Some graduate school	235	31.00
Graduate degree	323	42.61
Gestational age at birth (weeks)			39.3 (1.8)
≥37 weeks	691	91.16
<37 weeks	67	8.84
Infant sex
Male	371	48.94
Female	387	51.06
Infant age at exam (days)			6.4 (15.5)
≤ 3 days	626	82.59
> 3 days	132	17.41
Infant birthweight (g)			3356 (558)
≤2500	41	5.42
>2500 and ≤ 4000	633	83.73
>4000	82	10.85

^aSome rows sum to <758 because of missing values.