TABLE 3.
Baseline characteristics for the singleton cohort by hypertension definition (2009–2014).
| Characteristic | Non-hypertensive (n = 126,682) |
Traditional Definition* (n = 13,033) |
BP-Inclusive Definition** (n = 13,592) |
| Maternal age at delivery, Mean ± SD | 29.9 ± 5.8 | 31.0 ± 6.3 | 31.0 ± 6.2 |
| Age at delivery, N (%) | |||
| 15–19 | 6,462 (5.1) | 599 (4.6) | 562 (4.1) |
| 20–24 | 17,111 (13.5) | 1,603 (12.3) | 1,645 (12.1) |
| 25–29 | 33,187 (26.2) | 2,824 (21.7) | 3,064 (22.5) |
| 30–34 | 41,967 (33.1) | 4,010 (30.8) | 4,205 (30.9) |
| 35–50 | 27,955 (22.1) | 3,997 (30.7) | 4,116 (30.3) |
| Race/Ethnicity, N (%) | |||
| White | 32,232 (25.4) | 3,080 (23.6) | 3,628 (26.7) |
| Asian | 16,622 (13.1) | 1,416 (10.9) | 1,444 (10.6) |
| Black | 9,831 (7.8) | 1,692 (13) | 1,659 (12.2) |
| Hispanic | 65,772 (51.9) | 6,566 (50.4) | 6,582 (48.4) |
| Other | 2,225 (1.8) | 279 (2.1) | 279 (2.1) |
| Maternal education, N (%) | |||
| Less than high school | 10,377 (8.2) | 1,065 (8.2) | 1,030 (7.6) |
| High school | 29,770 (23.5) | 3,043 (23.3) | 3,201 (23.6) |
| College | 67,497 (53.3) | 7,187 (55.1) | 7,541 (55.5) |
| Graduate | 18,840 (14.9) | 1,724 (13.2) | 1,806 (13.3) |
| Unknown | 198 (0.2) | 14 (0.1) | 14 (0.1) |
| BMI, N (%) | |||
| <18.5 | 8,504 (6.7) | 658 (5) | 616 (4.5) |
| 18.5–24.9 | 54,535 (43) | 2,952 (22.7) | 2,940 (21.6) |
| 25.0–29.9 | 34,467 (27.2) | 3,414 (26.2) | 3,444 (25.3) |
| >30.0 | 29,174 (23) | 6,009 (46.1) | 6,591 (48.5) |
| Missing | 2 (0) | 0 | 1 (0) |
| Parity, N (%) | |||
| 0 | 50,824 (40.1) | 5,845 (44.8) | 6,073 (44.7) |
| 1 | 40,124 (31.7) | 3,662 (28.1) | 3,829 (28.2) |
| 2 | 17,268 (13.6) | 1,586 (12.2) | 1,677 (12.3) |
| >3 | 8,443 (6.7) | 832 (6.4) | 864 (6.4) |
| Missing | 10,023 (7.9) | 1,108 (8.5) | 1,149 (8.5) |
| Co-morbidities, N (%) | |||
| Diabetes | 1,051 (0.8) | 713 (5.5) | 715 (5.3) |
| Heart disease | 311 (0.2) | 61 (0.5) | 57 (0.4) |
| Renal disease | 87 (0.1) | 91 (0.7) | 92 (0.7) |
| Outpatient blood pressures, median, (IQR) | |||
| Total blood pressures | 14 (11, 17) | 19 (14, 28) | 18 (14, 28) |
| Total elevated blood pressures | – | 4 (2, 7) | 3 (2, 7) |
| Time between first and last elevated blood pressure, days | – | 126 (25, 197) | 152 (52, 203) |
*“Traditional Definition” is based on discharge diagnosis codes from the delivery hospitalization. **“BP-Inclusive Definition” is based on measured blood pressure values, diagnosis codes and dispensed antihypertensive medications. 10,809 women met both the Traditional and the BP-Inclusive Definition.