TABLE 1.
Demographic/baseline/enrollment characteristics, by timing of delivery
| Characteristic | Preterm delivery (<370/7 wk) N=25 | Term delivery (≥370/7 wk) n=17 | P value |
|---|---|---|---|
| Maternal age, y, mean±standard deviation | 31.9±6.2 | 33.2±6.1 | .503 |
| Black race | 7 (28.0) | 6 (37.5) | .524 |
| Married | 15 (60.0) | 10 (58.8) | .939 |
| Smoked during pregnancy | 6 (24.0) | 1 (5.9) | .210 |
| Nulliparous | 5 (20.0) | 4 (23.5) | >.99 |
| Received 17-alpha hydroxyprogesterone caproatea | 12/18 (66.7) | 11/12 (91.7) | .193 |
| Diagnosed as having a short cervical length, <25 mm by endovaginal ultrasound before 24 wk gestationb | 13 (61.9) | 5 (35.7) | .129 |
| Shortest cervical length by endovaginal ultrasound before 24 wk gestation, median mm (interquartile range)b | 14 (3.6–28) | 30 (1.3–37) | .087 |
| Cervical cerclage present during current pregnancy | 19 (76.0) | 8 (50.0) | .087 |
| Received vaginal progesterone | 6 (24.0) | 5 (29.4) | .695 |
| Male fetus | 15 (60.0) | 7 (41.2) | .231 |
Data are expressed as number (percentage), unless specified.
a
Among 30 patients with at least 1 previous spontaneous preterm birth;
b
Among 37 patients with at least 1 endovaginal cervical length assessment between 16.0 and 24.0 weeks’ gestation.