Baseline data
| GAP in upright position n=388 | Upright position n=386 | Routine practice n=384 | |||||||
| n | Mean | SD | n | Mean | SD | n | Mean | SD | |
| Age (years) | 388 | 21.9 | 3.6 | 386 | 21.8 | 3.4 | 384 | 21.7 | 3.2 |
| Gestational age (completed weeks) | 388 | 37.8 | 1.6 | 386 | 37.8 | 1.6 | 384 | 37.9 | 1.7 |
| Weight (kg) | 386 | 72.8 | 13.7 | 385 | 73.5 | 13.6 | 381 | 73.1 | 13.9 |
| Height (cm) | 382 | 159.3 | 6.9 | 381 | 159.8 | 7.7 | 376 | 158.8 | 7.9 |
| BMI (kg/m2) | 381 | 28.7 | 5.2 | 381 | 28.8 | 5.4 | 374 | 28.9 | 5.2 |