Table 1.
Demographics of women included in this study.
| INTERGROWTH-21st (n = 4233) | INTERBIO-21st | ||
|---|---|---|---|
| Characteristic | Training set (n = 3809) | Internal validation (n = 424) | External validation (n = 2433) |
| Maternal age (years) | 27.8 ± 3.8 | 27.9 ± 3.9 | 30.2 ± 5.1 |
| Maternal height (cm) | 162.2 ± 5.8 | 162.4 ± 6.0 | 160.9 ± 7.1 |
| Maternal weight (kg) | 61.6 ± 9.2 | 61.2 ± 9.2 | 65.2 ± 12.3 |
| Maternal BMI (kg/m2) | 23.3 ± 3.0 | 23.0 ± 2.8 | 25.1 ± 4.2 |
| GA at first visit (weeks) | 11.8 ± 1.4 | 11.8 ± 1.4 | 11.9 ± 1.3 |
| Nulliparous | 2612 (68.6) | 292 (69.3) | 976 (40.1) |
| Pre-eclampsia | 29 (0.8) | 5 (1.2) | 33 (1.4) |
| Preterm delivery (<37 weeks’ gestation) | 179 (4.7) | 12 (2.8) | 286 (11.8) |
| Birth weight (kg)* | 3.3 ± 0.441 | 3.2 ± 0.465 | 3.2 ± 0.5 |
| Birth weight <2500 g* | 103 (2.8) | 23 (5.6) | 100 (4.7) |
| Newborn sex male | 1903 (50.0) | 199 (46.9) | 1281 (52.7) |
Table showing the demographics of the INTERGROWTH-21st dataset used to train the model, the separate dataset used for internal validation and the INTERBIO-21st dataset used for external validation of the model.
*≥37 weeks gestation only.
Data are given as mean ± SD or n (%).
Maternal baseline characteristics were measured at <14 weeks’ gestation.
BMI Body Mass Index, GA Gestational Age.