Table 2 Primary outcome unadjusted results
| Â | Bag mask ventilation (N=33) | No bag mask ventilation (N=1072) | Odds ratio for bag mask ventilation use |
|---|---|---|---|
No. Fetuses, n (%)a | |||
 Singleton | 28 (85) | 957 (89) | 1.9 (0.7, 5.4) |
 Multiples | 5 (15) | 80 (7) | 1.0 |
 Missing/unknownd | 0 | 35 |  |
Fetal presentation, n (%)b | |||
 Vertex | 24 (73) | 835 (78) | 1.4 (0.6, 3.2) |
 Other | 9 (27) | 200 (19) | 1.0 |
 Missing/unknownd | 0 | 37 |  |
Amniotic fluid, n (%)c | |||
 Normal | 30 (91) | 1012 (94) | 4.2 (1.2, 14.9) |
 Abnormal | 3 (9) | 24 (2) | 1.0 |
 Missing/unknownd | 0 | 36 |  |