Table 2.
Time from retracted cervix to vaginal delivery and risks of maternal complications during the early postpartum period; analyses are stratified by parity and by previous mode of delivery in parous women
| Time from retracted cervix to birth (hours) | Primiparous (n = 38 418) | Parous, previous caesarean (n = 3299) | Parous, no previous caesarean (n = 29 987) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | % | aORa | 95% CI | n | % | aORa | 95% CI | n | % | aORa | 95% CI | |
| Any maternal complication | ||||||||||||
| <1 | 412 | 3.2 | 1.00 | Reference | 82 | 5.1 | 1.00 | Reference | 338 | 1.3 | 1.00 | Reference |
| 1 to <2 | 506 | 4.5 | 1.28 | 1.11–1.47 | 71 | 8.6 | 1.62 | 1.13–2.32 | 109 | 3.5 | 2.27 | 1.78–2.90 |
| 2 to <3 | 408 | 5.9 | 1.54 | 1.32–1.79 | 35 | 7.7 | 1.56 | 1.00–2.43 | 45 | 4.8 | 2.97 | 2.09–4.22 |
| 3 to <4 | 285 | 6.3 | 1.63 | 1.38–1.93 | 34 | 12.0 | 2.42 | 1.52–3.87 | 22 | 6.3 | 3.65 | 2.25–5.94 |
| ≥4 | 242 | 8.2 | 2.08 | 1.74–2.49 | 18 | 12.8 | 2.31 | 1.25–4.24 | 7 | 5.3 | 3.16 | 1.44–6.94 |
| Maternal infection | ||||||||||||
| <1 | 211 | 1.7 | 1.00 | Reference | 29 | 1.8 | 1.00 | Reference | 181 | 0.7 | 1.00 | Reference |
| 1 to <2 | 216 | 1.9 | 1.08 | 0.88–1.32 | 31 | 3.8 | 2.53 | 1.43–4.46 | 46 | 1.5 | 2.15 | 1.51–3.05 |
| 2 to <3 | 170 | 2.5 | 1.24 | 1.00–1.55 | 13 | 2.9 | 1.87 | 0.91–3.86 | 15 | 1.6 | 2.24 | 1.28–3.92 |
| 3 to <4 | 101 | 2.2 | 1.12 | 0.86–1.45 | 11 | 3.9 | 2.53 | 1.15–5.57 | 7 | 2.0 | 2.74 | 1.24–6.05 |
| ≥4 | 92 | 3.1 | 1.54 | 1.18–2.01 | 9 | 6.4 | 3.85 | 1.58–9.38 | 2 | 1.5 | 1.93 | 0.47–8.01 |
| Urinary retention | ||||||||||||
| <1 | 123 | 1.0 | 1.00 | Reference | 38 | 2.4 | 1.00 | Reference | 103 | 0.4 | 1.00 | Reference |
| 1 to <2 | 206 | 1.8 | 1.67 | 1.32–2.12 | 30 | 3.6 | 1.09 | 0.65–1.85 | 47 | 1.5 | 2.52 | 1.71–3.72 |
| 2 to <3 | 187 | 2.7 | 2.26 | 1.77–2.90 | 21 | 4.6 | 1.55 | 0.87–2.78 | 29 | 3.1 | 4.51 | 2.80–7.26 |
| 3 to <4 | 167 | 3.7 | 3.06 | 2.37–3.96 | 19 | 6.7 | 2.14 | 1.15–3.98 | 13 | 3.7 | 5.09 | 2.67–9.69 |
| ≥4 | 141 | 4.8 | 3.79 | 2.89–4.96 | 11 | 7.8 | 2.30 | 1.06–5.00 | 3 | 2.3 | 3.14 | 0.96–10.27 |
| Haematoma or ruptured sutures | ||||||||||||
| < 1 | 101 | 0.8 | 1.00 | Reference | 23 | 1.4 | 1.00 | Reference | 61 | 0.2 | 1.00 | Reference |
| 1 to < 2 | 111 | 1.0 | 1.17 | 0.88–1.55 | 19 | 2.3 | 1.66 | 0.84–3.25 | 18 | 0.6 | 1.99 | 1.07–3.70 |
| 2 to < 3 | 74 | 1.1 | 1.19 | 0.86–1.65 | 7 | 1.5 | 1.37 | 0.55–3.46 | 4 | 0.4 | 1.90 | 0.66–5.52 |
| 3 to < 4 | 33 | 0.7 | 0.79 | 0.52–1.21 | 5 | 1.8 | 1.56 | 0.53–4.53 | 3 | 0.9 | 2.50 | 0.58–10.77 |
| ≥4 | 26 | 0.9 | 1.01 | 0.64–1.59 | 1 | 0.7 | 0.62 | 0.08–4.93 | 2 | 1.5 | 6.51 | 1.48–28.61 |
a
Adjusted for maternal age, height, body mass index, parental cohabitation, smoking, induction of labour, gestational age epidural analgesia and oxytocin augmentation.