Table 1 Baseline characteristics of the datasets.
Characteristics | Internal training set | Internal validation set | Internal test set | External validation set |
|---|---|---|---|---|
Gestational age (w) | 39.1 ± 1.4 | 39.1 ± 1.2 | 38.1 ± 2.2 | 38.6 ± 1.5 |
Birth weight (g) | 3446.8 ± 473.0 | 3449.5 ± 482.6 | 3038.5 ± 570.5 | 3205.5 ± 516.5 |
Subjects | 774 | 209 | 209 | 152 |
Poor quality | 532 | 146 | 144 | 380 |
 DC | 138 | 19 | 35 | 99 |
 OF | 122 | 50 | 35 | 138 |
 IPD | 272 | 77 | 74 | 143 |
Adequate quality | 2531 | 628 | 655 | 414 |
 DC | 776 | 191 | 226 | 158 |
 OF | 671 | 157 | 190 | 127 |
 IPD | 1084 | 280 | 239 | 129 |
Excellent quality | 4678 | 1298 | 1288 | 678 |
