Table 8 Delivery factors associated with amniotic fluid embolism

caesarean section After labour RR 48.5 (6.1-380)

Without labour RR 8.1 (0.7-89)

caesarean section Cephalic aOR 12.5 (7.9-19.9)

Non-cephalic aOR 8.6 (4.3-17.4)

caesarean section RR 2.2 (0.5-11.1)

Cases occurring post delivery only

caesarean section aOR^≈ 20.3 (4.3-95.3)

caesarean section aOR 5.7 (3.7-8.7)

instrumental

RR 36.0 (4.4-300)

Forceps aOR 5.9 (3.4-10.3)

Vacuum aOR 2.9 (1.6-5.3)

Vacuum RR 1.5 (0.2-12.3)

Forceps or vacuum aOR^≈ 11.6 (1.7-79.8)

Forceps aOR 4.3 (1.9-7.6)

Vacuum aOR 1.9 (1.0-3.7)

vaginal breech birth

RR 151 (9.4-2400)

All cases

Caesarean section aOR^¥ 23.3 (7.8-69.7)

Forceps or vacumm aOR^¥ 8.9 (2.0-39.5)

RR 19.4 (3.9-96)

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aOR 1.6 (0.9-3.0)

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OR 2.4 (0.7-8.1)

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< 37 weeks

RR 1.9 (0.4-8.6)

37-40 weeks

1.0 (referent)

≥ 41 weeks

RR 1.7 (0.6-4.8)

> 42 weeks

aOR 1.4 (0.9-2.3)

< 37 weeks

RR 9.7 (2.3-40.8)

> 42 weeks

RR 3.2 (0.4-25.8)

≥ 41 weeks

aOR^≠ 0.4 (0.2-1)

*