Table 3. Demographic and clinical characteristics of study group as a function of gestational age at delivery: before and after 34 weeks of gestation.
| Characteristics | Delivery before 34 weeks (n = 20) | Delivery at or after 34 weeks (n = 29) | p value |
|---|---|---|---|
| Gestational age at recruitment (weeks) | 26.0 (24.5–28.0) | 27 (24.6–30.2) | 0.28 |
| Gestational age at delivery (weeks) | 30.9 (30.1–31.8) | 36.4 (35.1–38.0) | <0.001 |
| Maternal age (years) | 31.0 (27.5–35.2) | 31.0 (28.5–34.0) | 0.93 |
| Pregestational BMI (kg/m2) | 21.3 (19.7–25.1) | 21.0 (19.0–25.5) | 0.88 |
| BMI at recruitment (kg/m2) | 25.4 (23.1–29.1) | 24.8 (22.2–29.4) | 0.74 |
| Gravidity | 1.5 (1–2) | 2 (1–3.5) | 0.81 |
| Parity | 0 (0–1.0) | 0 (0–1.0) | 0.91 |
| Nulliparous, n (%) | 10 (50) | 14 (48.3) | 0.56 |
| Sonographic cervical length (mm) | 8 (5–11.5) | 12 (8.0–13) | 0.11 |
| Cervical dilatation (cm) | 0.5 (0–1) | 0 (0–0.5) | 0.1 |
| Days of activity measurement | 18.5 (12.2–25.2) | 14 (9.0–17.0) | 0.09 |
| Singleton, n (%) | 8 (40) | 15 (51.7) | 0.56 |
| History of preterm birth, n (%) | 2 (10) | 4 (13.7) | 1.00 |
| Cerclage, n (%) | 2 (10) | 3 (10.3) | 1.00 |
| Steps per day | 3530 (2876–4873) | 3969 (3068–4788) | 0.72 |
Data are presented as median and interquartile range (IQR). BMI—Body Mass Index.