Table 1.
Comparison of clinical data between the training and validation cohorts [n (%)]/(x̅ ± sd)
| Training cohort (n=220) | Validation cohort (n=110) | t/χ2 | P | |
|---|---|---|---|---|
| Age | 38.51±2.99 | 38.86±2.64 | 1.055 | 0.292 |
| Marital status | ||||
| Unmarried | 4 (1.82) | 3 (2.73) | 0.018 | 0.893 |
| Married | 216 (98.18) | 107 (97.27) | ||
| Educational background | 0.070 | 0.966 | ||
| Primary school | 25 (11.36) | 13 (11.82) | ||
| Middle and high school | 65 (29.55) | 31 (28.18) | ||
| College | 130 (59.09) | 66 (60.00) | ||
| Pre-pregnancy BMI (kg/m2) | 22.46±2.50 | 22.29±2.16 | 0.196 | 0.845 |
| Pregnancy BMI (kg/m2) | 27.85±2.96 | 28.17±2.54 | 0.969 | 0.333 |
| Gestational age (week) | 38.07±2.21 | 38.24±2.36 | 0.637 | 0.524 |
| Number of Pregnancies | 1.210 | 0.546 | ||
| 1-2 times | 165 (75.00) | 88 (80.00) | ||
| 3-4 times | 48 (21.82) | 20 (18.18) | ||
| > 4 times | 7 (3.18) | 2 (1.82) | ||
| Placenta previa | 0.140 | 0.708 | ||
| No | 195 (88.64) | 99 (90.00) | ||
| Yes | 25 (11.36) | 11 (10.00) | ||
| Amniotic fluid contamination | 0.050 | 0.824 | ||
| No | 188 (85.45) | 95 (96.36) | ||
| Yes | 32 (14.55) | 15 (13.64) | ||
| HDP | 0.010 | 0.919 | ||
| No | 181 (82.27) | 90 (81.82) | ||
| Yes | 39 (17.73) | 20 (18.18) | ||
| GDM | ||||
| No | 185 (84.09) | 91 (82.73) | 0.100 | 0.752 |
| Yes | 35 (15.91) | 19 (17.27) | ||
| Uterine fibroids | 0.052 | 0.819 | ||
| No | 190 (86.36) | 96 (87.27) | ||
| Yes | 30 (13.64) | 14 (12.73) | ||
| Fetal macrosomia | 0.087 | 0.769 | ||
| No | 204 (92.73) | 101 (91.82) | ||
| Yes | 16 (7.27) | 9 (8.18) | ||
| Uterine atony | 0.185 | 0.667 | ||
| No | 155 (70.45) | 80 (72.73) | ||
| Yes | 65 (29.55) | 30 (27.27) | ||
| Scarred uterus | 0.202 | 0.653 | ||
| No | 188 (85.45) | 96 (87.27) | ||
| Yes | 32 (14.55) | 14 (12.73) | ||
| Assisted reproduction | 0.191 | 0.662 | ||
| No | 217 (98.64) | 107 (97.27) | ||
| Yes | 3 (1.36) | 3 (2.73) |
Note: BMI, body mass index; HDP, hypertensive disorder of pregnancy; GDM, gestational diabetes mellitus.