Table 1 Comparison between women with EP and VP births. BMI, body mass index. *, t value
From: Analysis of risk factors related to extremely and very preterm birth: a retrospective study
Characteristics | Number(n) | EP(n = 287) | VP(n = 1311) | χ2/t | P |
|---|---|---|---|---|---|
Age (yrs), mean (SD) | 1598 (100.00) | 30.36 (3.85) | 30.40 (4.01) | 0.60* | 0.437 |
Abortion ≥ 3, n (%) | 133 (8.32) | 29 (10.10) | 104 (7.93) | 1.46 | 0.228 |
Primipara, n (%) | 948 (59.32) | 201 (70.03) | 747 (56.98) | 16.63 | 0.000 |
BMI ≥ 25, n (%) | 680 (42.55) | 112 (39.02) | 568 (43.33) | 1.78 | 0.182 |
Days admitted to the hospital ≥ 3, n (%) | 275 (17.21) | 50 (17.42) | 225 (17.16) | 0.01 | 0.916 |
Assisted reproduction, n (%) | 272 (17.02) | 51 (17.77) | 221 (16.86) | 0.14 | 0.709 |
Blood type of O, n (%) | 552 (34.54) | 92 (32.06) | 460 (35.09) | 0.96 | 0.328 |
Scar uterus, n (%) | 304 (19.02) | 35 (12.20) | 269 (20.52) | 10.59 | 0.001 |
Male newborn, n (%) | 908 (56.82) | 173 (60.28) | 735 (56.06) | 1.70 | 0.192 |
PPROM, n (%) | 716 (44.81) | 103 (35.89) | 613 (46.76) | 11.25 | 0.001 |
GDM, n (%) | 354 (22.15) | 50 (17.42) | 304 (23.19) | 4.54 | 0.033 |
Multiple pregnancy, n (%) | 289 (18.09) | 71 (24.74) | 218 (16.63) | 10.45 | 0.001 |
Abnormal fetal position, n (%) | 331 (20.71) | 45 (15.68) | 286 (21.82) | 5.40 | 0.020 |
Placental factors, n (%) | 167 (10.45) | 22 (7.67) | 145 (11.06) | 2.90 | 0.089 |
Cervical incompetency,n (%), | 112 (7.01) | 40 (13.94) | 72 (5.49) | 25.77 | 0.000 |
Fetal distress, n (%) | 178 (11.14) | 6 (2.09) | 172 (13.12) | 28.94 | 0.000 |
HDCP, n (%) | 185 (11.58) | 7 (2.44) | 178 (13.58) | 28.54 | 0.000 |
Amniotic fluid anomaly, n (%) | 287 (17.96) | 36 (12.54) | 251 (19.15) | 6.97 | 0.008 |
Abnormal vasa umbilicalis, n (%) | 114 (7.13) | 8 (2.79) | 106 (8.09) | 9.98 | 0.002 |
Chorioamnionitis, n (%) | 360 (22.53) | 54 (18.82) | 306 (23.34) | 2.76 | 0.096 |