Table 1.

Demographics of participants in the EAGeR Cohort (n = 1228)

	Total (n = 1,228) n (%)	LDA (n = 615) n (%)	Placebo (n = 613) n (%)	p-Value
Age (y) Mean, (SD)	28.7 (4.8)	28.8 (4.9)	28.7 (4.7)	0.68
Prepregnancy BMI (kg/m2) Mean (SD)	26.3 (6.5)	26.2 (6.6)	26.4 (6.4)	0.45
Race/ethnicity				0.13
White	1,162 (94.6)	576 (93.7)	586 (95.6)
Non-White	66 (5.4)	39 (6.3)	27 (4.4)
Education				0.89
< high school	25 (2.0)	13 (2.1)	12 (2.0)
High school	145 (11.8)	75 (12.2)	70 (11.4)
≥ high school	1,057 (86.2)	526 (85.7)	531 (86.6)
Household income ($)				0.44
< 40,000	208 (33.9)	198 (32.3)	406 (33.1)
40,000– < 100,000	155 (25.3)	175 (28.5)	330 (26.9)
≥ 100,000	250 (40.8)	241 (39.3)	491 (40.0)
Smoking in the past year				0.22
Yes	150 (12.3)	79 (13.0)	71 (11.7)
No	529 (87.7)	529 (87.0)	538 (88.3)
Number of previous pregnancies				0.84
1	417 (34.0)	206 (33.5)	211 (34.4)
2	447 (36.4)	230 (37.4)	217 (35.4)
3	272 (22.2)	136 (22.1)	136 (22.2)
4	92 (7.5)	43 (7.0)	49 (8.0)
Number of previous losses				0.28
1	825 (76.2)	422 (68.6)	403 (65.7)
2	403 (32.8)	193 (31.4)	210 (34.3)
Number of previous live births				0.88
0	577 (47.0)	287 (46.7)	290 (47.3)
1	438 (35.7)	218 (35.5)	220 (35.9)
2	213 (17.4)	110 (17.9)	103 (16.8)
Number of previous vaginal deliveries				0.74
0	754 (61.4)	371 (60.3)	383 (62.5)
1	317 (25.8)	163 (26.5)	154 (25.1)
2	157 (12.8)	81 (13.2)	76 (12.4)
Number of previous cesarean deliveries				0.96
0	1,053 (85.8)	529 (86.0)	524 (85.5)
1	135 (11.0)	66 (10.7)	69 (11.3)
2	40 (3.3)	20 (3.3)	20 (3.3)

Abbreviations: BMI, body mass index; EAGeR, effects of aspirin in gestation and reproduction; LDA, low-dose aspirin; SD, standard deviation.