Table 2.
2nd pregnancy maternal characteristics and 1st pregnancy obstetric outcomes among 1st pregnancy normotensive women
| Maternal characteristics of the 2nd pregnancy/obstetric outcomes of the 1st pregnancy | 2nd pregnancy outcome | |||
|---|---|---|---|---|
| Normotensive (N = 23,291) | Gestational hypertension (N = 284) | Preeclampsia (N = 255) | Chronic hypertension (N = 73) | |
| Maternal characteristics of the 2nd pregnancy | ||||
| Maternal age (years)a,b | 26.1 (4.1) | 26.5 (4.3) | 26.5 (4.3) | 27.7 (4.6) |
| Age >35 years | 678 (2.9) | 12 (4.2) | 5 (2.0) | 4 (5.5) |
| Non-Hispanic White | 20,247 (87.0) | 261 (91.9) | 223 (87.8) | 63 (86.3) |
| Private insurance | 16,895 (72.5) | 213 (75.0) | 167 (65.5) | 48 (65.8) |
| Married | 20,743 (89.1) | 259 (91.2) | 220 (86.3) | 62 (84.9) |
| Smoke during pregnancy | 671 (2.9) | 12 (4.2) | 10 (3.9) | 7 (9.6) |
| Alcohol during pregnancy | 378 (1.6) | 4 (1.4) | 7 (2.8) | 0 (0) |
| Interpregnancy interval (days)a | 579.8 (335.2) | 638.0 (370.4) | 646.9 (404.1) | 719.4 (474.5) |
| Interpregnancy interval, (months) | ||||
| 0–5 | 1,337 (5.7) | 16 (5.6) | 20 (7.8) | 3 (4.1) |
| 6–11 | 4,298 (18.5) | 50 (17.6) | 33 (12.9) | 17 (23.3) |
| 12–17 | 6,177 (26.5) | 49 (17.3) | 71 (27.8) | 16 (21.9) |
| 18–23 | 5,108 (21.9) | 68 (23.9) | 39 (15.3) | 6 (8.2) |
| ≥24 | 6,371 (27.4) | 101 (35.6) | 92 (36.1) | 31 (42.5) |
| Preexisting diabetes mellitus | 313 (1.3) | 4 (1.4) | 4 (1.6) | 8 (11.0) |
| Asthma/depression/thyroid disease | 4,758 (20.4) | 68 (23.9) | 53 (20.8) | 25 (34.3) |
| Major postpartum weight retention/weight gain ≥4.55 kg | 5,553 (24.6) | 118 (43.5) | 90 (36.1) | 33 (48.5) |
| Prepregnancy BMI, (kg/m2)a | 24.3 (5.2) | 28.0 (7.0) | 27.2 (6.5) | 32.9 (8.5) |
| Prepregnancy BMI, (kg/m2) | ||||
| Underweight and Normal (≤24.9) | 15,136 (65.9) | 109 (39.1) | 117 (46.1) | 16 (22.9) |
| Obese class I (25.0–29.9) | 4,867 (21.2) | 88 (31.5) | 68 (26.8) | 11 (15.7) |
| Obese class II (30.0–34.9) | 1,873 (8.2) | 37 (13.3) | 34 (13.4) | 14 (20.0) |
| Obese class II and III (≥35.0) | 1,086 (4.7) | 45 (16.1) | 35 (13.8) | 29 (41.4) |
| Obstetric outcomes of the 1st pregnancy | ||||
| SGA in 1st pregnancy | 933 (4.0) | 16 (5.7) | 18 (7.1) | 3 (4.1) |
| Preterm <34 weeks in 1st pregnancyc | 366 (1.6) | 14 (4.9) | 15 (5.9) | 4 (5.5) |
| Spontaneous preterm | 299 (81.7) | 10 (71.4) | 14 (93.3) | 4 (100) |
| Indicated preterm | 40 (10.9) | 3 (21.4) | 1 (6.7) | 0 |
| 1st pregnancy admission blood pressured | ||||
| Normotensive | 13,325 (57.3) | 85 (30.0) | 78 (30.6) | 20 (27.8) |
| Borderline | 5,945 (25.5) | 89 (31.5) | 77 (30.2) | 22 (30.6) |
| Hypertensive | 4,007 (17.2) | 109 (38.5) | 100 (39.2) | 30 (41.7) |
| Gestational diabetes in 1st pregnancy | 407 (1.8) | 10 (3.5) | 5 (2.0) | 3 (4.1) |
Data were missing for: race/ethnicity: 27; married: 2; smoke: 18; alcohol: 61; major postpartum weight retention/weight gain: 702; prepregnancy BMI: 338; SGA in 1st pregnancy: 25; 1st pregnancy admission blood pressure: 16. All figures are N (%) unless otherwise stated.
Abbreviations: BMI: body mass index; SGA: small for gestational age.
aMean (SD).
bAt the 1st delivery, the mean (SD) of age of the overall group was 23.8 (4.0) years, range: 13–43 years.
c28 had elective preterm delivery.
d1st pregnancy admission blood pressure categorized as: normotensive if both systolic blood pressure (SBP) and diastolic blood pressure (DBP) were ≤129/84mm Hg, borderline if either SBP or DBP was 130–139/85–89mm Hg, and hypertensive if either SBP or DBP was ≥140/90mm Hg.