Table 1.
Demographic characteristics of women in different groups.
| Duration of membrane rupture | < 6 h (n = 23) | 6 to < 12 h (n = 24) | 12 to < 24 h (n = 26) | 24 to < 48 h (n = 18) | ≥ 48 h (n = 11) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mean ± sd/n (%) | Mean ± sd/n (%) | p | Mean ± sd/n (%) | p | Mean ± sd/n (%) | p | Mean ± sd/n (%) | p | |
| Maternal condition | |||||||||
| Maternal age (years) | 29.8 ± 2.4 | 29.0 ± 3.7 | 0.37 | 31.0 ± 3.4 | 0.19 | 29.9 ± 3.7 | 0.95 | 29.2 ± 4.3 | 0.58 |
| Times of gestation | 1.4 ± 0.7 | 1.8 ± 1.2 | 0.22 | 1.6 ± 0.8 | 0.39 | 1.9 ± 1.3 | 0.10 | 2.0 ± 1.3 | 0.16 |
| Times of parity | 0.1 ± 0.3 | 0.0 ± 0.2 | 0.29 | 0.0 ± 0.0 | 0.08 | 0.2 ± 0.4 | 0.75 | 0.1 ± 0.3 | 0.74 |
| Gestational age at delivery (weeks) | 39.0 ± 1.7 | 38.5 ± 2.0 | 0.39 | 38.7 ± 1.5 | 0.51 | 37.9 ± 4.5 | 0.31 | 34.7 ± 6.0* | 0.04* |
| Count of WBC (109/L) | 8.8 ± 2.3 | 10.0 ± 2.5 | 0.08 | 10.1 ± 3.7 | 0.15 | 9.9 ± 3.5 | 0.23 | 10.0 ± 2.9 | 0.19 |
| Percentage of N (%) | 74.1 ± 5.9 | 73.9 ± 7.5 | 0.90 | 76.9 ± 6.2 | 0.11 | 72.4 ± 10.4 | 0.52 | 71.9 ± 10.9 | 0.44 |
| Preterm birth, n (%) | 3 (13.0) | 4 (16.7) | 0.73 | 3 (11.5) | 0.87 | 2 (11.1) | 0.85 | 4 (36.4) | 0.12 |
| Maternal infection, n (%) | 0 (0) | 1 (4.2) | 0.32 | 3 (11.5) | 0.09 | 4 (22.2) | 0.02* | 1 (9.1) | 0.14 |
| Antibiotic administration, n (%) | 4 (17.4) | 5 (20.8) | 0.76 | 8 (30.8) | 0.28 | 5 (27.8) | 0.43 | 4 (36.4) | 0.22 |
| Meconium stained amniotic, n (%) | 3 (13.0) | 1 (4.2) | 0.28 | 2 (7.7) | 0.54 | 1 (5.6) | 0.42 | 1 (9.1) | 0.74 |
| Cesarean section, n (%) | 6 (26.1) | 7 (29.2) | 0.81 | 10 (38.5) | 0.36 | 8 (44.4) | 0.22 | 7 (63.6) | 0.04* |
| GDM, n (%) | 1 (4.3) | 3 (12.5) | 0.32 | 2 (7.7) | 0.63 | 2 (11.1) | 0.41 | 0 (0.0) | 0.48 |
| HDP, n (%) | 0 (0) | 2 (8.3) | 0.16 | 0 (0) | – | 0 (0) | – | 1 (9.1) | 0.14 |
| FGR, n (%) | 0 (0) | 0 (0) | – | 0 (0) | – | 0 (0) | – | 0 (0) | – |
| Neonatal condition | |||||||||
| Birth weight (g) | 3287 ± 467 | 3176 ± 453 | 0.41 | 3357 ± 504 | 0.62 | 3176 ± 794 | 0.58 | 2576 ± 1091 | 0.07 |
| Apgar score at 1 min < 7 | 0 (0) | 0 (0) | – | 1 (3.8) | 0.34 | 1 (5.6) | 0.25 | 1 (9.1) | 0.14 |
| Apgar score at 5 min < 7 | 0 (0) | 0 (0) | – | 0 (0) | – | 1 (5.6) | 0.25 | 1 (9.1) | 0.14 |
| Admission to neonatal ward, n (%) | 3 (13.0) | 4 (16.7) | 0.73 | 5 (19.2) | 0.56 | 4 (22.2) | 0.44 | 3 (27.3) | 0.31 |
| Neonatal infection, n (%) | 1 (4.3) | 1 (4.2) | 0.96 | 1 (3.8) | 0.93 | 2 (11.1) | 0.41 | 3 (27.3) | 0.05 |
| Perinatal mortality, n (%) | 0 (0) | 0 (0) | – | 0 (0) | – | 1 (5.6) | 0.25 | 1 (9.1) | 0.14 |
*Compared with < 6 h group, p ≤ 0.05.
WBC white blood cells, N neutrophilic granulocyte, GDM gestational diabetes mellitus, HDP hypertensive disorders of pregnancy, FGR fetal growth restriction.