Table 1.
Comparison of perinatal and demographic characteristics between the two groups.
| Characteristics | GA 23–24 W | n = 720 | p-value | GA 25–26 W | n = 1,363 | p-value | GA 23–26 W | n = 2,083 | p-value |
|---|---|---|---|---|---|---|---|---|---|
| Group 1 (n = 398) | Group 2 (n = 322) | Group 1 (n = 676) | Group 2 (n = 687) | Group 1 (n = 1,074) | Group 2 (n = 1,009) | ||||
| Gestational age (weeks) | 23.6 ± 0.5 | 23.6 ± 0.5 | 0.793 | 25.5 ± 0.5 | 25.6 ± 0.5 | 0.127 | 24.8 ± 1.0 | 24.9 ± 1.0 | 0.007 |
| Birth weight (g) | 656.6 ± 107.5 | 656 ± 105.4 | 0.979 | 833.1 ± 160.5 | 843.3 ± 151.7 | 0.227 | 767.7 ± 166.6 | 783.8 ± 163.6 | 0.026 |
| Apgar score, 1 min | 2.9 ± 1.6 | 2.6 ± 1.6 | 0.025 | 3.7 ± 1.7 | 3.6 ± 1.8 | 0.891 | 3.4 ± 1.7 | 3.3 ± 1.8 | 0.435 |
| Apgar score, 5 min | 5.3 ± 2.0 | 4.9 ± 2.0 | 0.015 | 6.1 ± 1.8 | 6.0 ± 1.8 | 0.237 | 5.8 ± 1.9 | 5.7 ± 2.0 | 0.076 |
| Hospital days (survival) | 127.8 ± 40.4 | 133.8 ± 54.3 | 0.326 | 103.9 ± 37.1 | 106.5 ± 41.1 | 0.275 | 111.5 ± 39.7 | 111.2 ± 44.7 | 0.865 |
| Body temperature (°C) | 35.8 ± 0.9 | 35.6 ± 0.9 | 0.109 | 36.0 ± 0.6 | 36.0 ± 0.7 | 0.305 | 35.9 ± 0.8 | 35.9 ± 0.8 | 0.206 |
| Male, n (%) | 199 (50.0) | 164 (50.9) | 0.804 | 315 (46.6) | 325 (47.3) | 0.793 | 560 (52.1) | 520 (51.5) | 0.782 |
| Antenatal steroid use, n (%) | 323 (81.2) | 214 (66.5) | <0.001 | 561 (83.0) | 531 (77.3) | 0.008 | 884 (82.3) | 745 (73.8) | <0.001 |
| Caesarean section, n (%) | 235 (59.0) | 196 (60.9) | 0.620 | 482 (71.3) | 524 (76.3) | 0.037 | 717 (66.8) | 720 (71.4) | 0.023 |
| PROM, n (%) | 203 (51.0) | 171 (53.1) | 0.575 | 275 (40.7) | 315 (45.9) | 0.054 | 478 (44.5) | 486 (48.2) | 0.094 |
| Histologic chorioamnionitis, n (%) | 228 (57.3) | 124 (38.5) | <0.001 | 308 (45.6) | 234 (34.1) | <0.001 | 536 (49.9) | 358 (35.5) | <0.001 |
| HDP (%) | 15 (3.8) | 20 (6.2) | 0.130 | 80 (11.8) | 55 (8.0) | 0.018 | 94 (8.8) | 75 (7.4) | 0.239 |
| In vitro fertilisation, n (%) | 115 (28.9) | 79 (24.5) | 0.190 | 166 (24.6) | 122 (17.8) | 0.002 | 281 (26.2) | 201 (19.9) | <0.001 |
Values are expressed as mean ± standard deviation or number (%).
GA, gestational age; HDP, hypertensive disorder of pregnancy; PROM, premature rupture of membranes; W, weeks.