Table 3. Maternal and pregnancy characteristics.

Gravidity
Gravida, median (IQR)	2 (1,4)
Parity
Nulliparous	494 (39.2%)
Multiparous	766 (60.8%)
History of preterm birth
Indicated	10 (0.8%)
Spontaneous	175 (13.9%)
24–33 6/7 weeks	107 (8.5%)
34–36 6/7 weeks	68 (5.4%)
History of pregnancy and medical complications
Asthma	248 (19.7%)
Gestational hypertension/Preeclampsia	214 (17.0%)
Chronic hypertension	144 (11.4%)
Diabetes	71 (5.6%)
Intrauterine growth restriction	60 (4.8%)
Thyroid disease	57 (4.5%)
Anomaly	47 (3.7%)
Heart disease	37 (2.9%)
Renal disease	29 (2.3%)
Polyhydramnios	22 (1.7%)
Oligohydramnios	10 (0.8%)
Lupus	6 (0.5%)

Except where noted, data are presented as n (%); IQR, interquartile range