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. 2021 Nov 8;21:756. doi: 10.1186/s12884-021-04204-7

Table 2.

Primary outcome unadjusted results

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

aN=1070

bN=1068

cN=1069

dDropped for adjusted analyses