Table 1.
Baseline characteristics (n=942).
| Characteristic | Valuea |
|---|---|
| Maternal age, y | 27 (22–31) |
| <20 | 83 (8.8) |
| 20–24 | 271 (28.8) |
| 25–30 | 278 (29.5) |
| ≥30 | 310 (32.9) |
| Maternal education | |
| No education | 13 (1.4) |
| Primary | 398 (42.3) |
| Secondary | 412 (43.7) |
| Post-secondary | 119 (12.6) |
| Marital status | |
| Never married | 131 (13.9) |
| Married/living together | 791 (84.0) |
| Divorced/separated/widowed | 19 (2.0) |
| BMI | 23.6 (21.2–27.1) |
| <18.5 | 47 (5.0) |
| 18.5–24 | 509 (54.0) |
| ≥25 | 386 (41.0) |
| Parity | 1 (0–2) |
| Prior spontaneous abortion | |
| 0 (nulliparous) | 352 (37.4) |
| 0 (parous) | 458 (48.6) |
| ≥1 | 132 (14.0) |
| Prior preterm birth(s) | |
| 0 (nulliparous) | 352 (37.4) |
| 0 (parous) | 305 (32.4) |
| ≥1 | 285 (30.3) |
| Vaginal bleeding at presentation | 75 (8.0) |
| HIV at enrollment | |
| Non-reactive | 747 (79.3) |
| Reactive | 195 (20.7) |
| Ultrasonography-estimated gestational age at presentation, wk | 15 (13–18) |
| <14 | 300 (31.9) |
| 14–24 | 642 (68.2) |
Abbreviation: BMI, body mass index (calculated as weight in kilograms divided by the square of height in meters).
a
Values are given as median (interquartile range) or number (percentage).