Table 1. Characteristics of participants in the analysis of placental tissues.
| Spontaneous preterm births (SPB) | Spontaneous term births (STB) | Term elective cesarean deliveries (TCS) | P-valuea | |
| Number of participants (n) | 10 | 10 | 10 | - |
| Maternal age in years (median, IQR) | 32 (29–33) | 31 (27–32) | 30 (25–35) | 0.703 |
| Nulliparous (n, %) | 6 (60%) | 4 (40%) | 4 (40%) | 0.585 |
| Weeks at delivery (median, IQR) | 31.2 (27.0–32.6) | 39.1 (38.4–40.0) | 38.5 (38.4–38.6) | <0.001b |
| Birthweight in grams (median, IQR) | 1468 (1135–1595) | 3120 (2990–3595) | 3203 (3010–3730) | <0.001b |
| Rupture of membrane >24 h before delivery (n, %) | 4 (40%) | 2 (20%) | 0 (0%) | 0.082 |
| Antepartum hemorrhage (n, %) | 2 (10%) | 1 (10%) | 0 (0%) | 0.329 |
a
Kruskal-Wallis test for continuous variables. Chi-square test for nominal variables.
b
Student-Newman-Keuls test, p<0.05: SPB<STB, SPB<TCS.