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Table 3 Prevalence, odds ratio (OR), adjusted OR (aOR), 99 % confidence intervals (CIs) and maternal outcomes during varying delivery volume time periods (quiet, optimal, busy) in each hospital category

From: Busy day effect on intrapartum adverse maternal outcomes – a population‐based study of 601 247 singleton deliveries

Hospital category

Population

Maternal outcome

Quiet day

Optimal day

Busy day

C1

All deliveries (n = 55 448, 100.0 %)

Blood transfusion (n, %)

80 (1.1)

439 (1.0)

47 (1.0)

OR (99 % CI)

1.11 (0.81–1.53)

Ref.

1.13 (0.76–1.68)

aOR (99 % CI)

1.11 (0.80–1.51)

Ref.

1.13 (0.76–1.69)

Vaginal

Deliveries

(n = 47 196, 85.1 %)

Manual removal of placenta (n, %)

134 (2.2)

822 (2.2)

71 (2.0)

OR (99 % CI)

1.02 (0.78–1.30)

Ref.

0.90 (0.65–1.24)

aOR (99 % CI)

0.98 (0.78–1.27)

Ref.

0.90 (0.65–1.25)

OASIS (n, %)

57 (0.9)

287 (0.8)

28 (0.8)

OR (99 % CI)

1.24 (0.85–1.80)

Ref.

1.02 (0.61–1.70)

aOR (99 % CI)

1.24 (0.85–1.80)

Ref.

1.04 (0.62–1.74)

C2

All deliveries (n = 165 573, 100.0 %)

Blood transfusion (n, %)

174 (1.2)

1906 (1.4)

263 (1.8)***

OR (99 % CI)

0.88 (0.72–1.08)

Ref.

1.29 (1.09–1.53)***

aOR (99 % CI)

0.87 (0.71–1.07)

Ref.

1.28 (1.08–1.52)***

Vaginal deliveries (n = 140 491, 84.9 %)

Manual removal of placenta (n, %)

215 (1.8)

2026 (1.7)

199 (1.6)

OR (99 % CI)

1.02 (0.86–1.23)

Ref.

0.94 (0.77–1.13)

aOR (99 % CI)

1.01 (0.84–1.22)

Ref.

0.94 (0.77–1.14)

OASIS (n, %)

88 (0.7)

1011 (0.9)

93 (0.8)

OR (99 % CI)

0.83 (0.63–1.11)

Ref.

0.88 (0.66–1.16)

aOR (99 % CI)

0.84 (0.63–1.12)

Ref.

0.89 (0.67–1.18)

C3

All deliveries (n = 54 574, 100.0 %)

Blood transfusion (n, %)

78 (1.5)

497 (1.2)

13 (0.2)***

OR (99 % CI)

1.27 (0.92–1.74)

Ref.

0.17 (0.08–0.35)***

aOR (99 % CI)

1.28 (0.92–1.73)

Ref.

0.17 (0.08–0.35)***

Vaginal deliveries (n = 45 265, 82.9 %)

Manual removal of placenta (n, %)

67 (1.5)

626 (1.8)

77 (1.4)

OR (99 % CI)

0.85 (0.61–1.19)

Ref.

0.82 (0.60–1.12)

aOR (99 % CI)

0.86 (0.62–1.21)

Ref.

0.80 (0.58–1.09)

OASIS (n, %)

34 (0.8)

237 (0.7)

41 (0.8)

OR (99 % CI)

1.14 (0.71–1.84)

Ref.

1.15 (0.74–1.78)

aOR (99 % CI)

1.15 (0.72–1.86)

Ref.

1.17 (0.75–1.82)

C4

All deliveries (n = 108 254, 100.0 %)

Blood transfusion (n, %)

403 (4.1)

3353 (3.8)

374 (3.6)

OR (99 % CI)

1.09 (0.95–1.25)

Ref.

0.95 (0.82–1.09)

aOR (99 % CI)

1.14 (0.99–1.31)

Ref.

0.93 (0.80–1.07)

Vaginal deliveries (n = 93 649, 86.5 %)

Manual removal of placenta (n, %)

177 (2.1)

1611 (2.1)

185 (2.0)

OR (99 % CI)

0.97 (0.80–1.20)

Ref.

0.95 (0.78–1.17)

aOR (99 % CI)

1.00 (0.81–1.23)

Ref.

0.92 (0.75–1.12)

OASIS (n, %)

161 (1.9)

1291 (1.7)

165 (1.8)

OR (99 % CI)

1.10 (0.89–1.38)

Ref.

1.06 (0.86–1.32)

aOR (99 % CI)

1.20 (0.96–1.50)

Ref.

1.04 (0.84–1.29)

C5

All deliveries (n = 217 398, 100.0 %)

Blood transfusion (n, %)

420 (1.7)***

3710 (2.2)

597 (2.8)***

OR (99 % CI)

0.78 (0.69–0.90)***

Ref.

1.28 (1.14–1.44)***

aOR (99 % CI)

0.78 (0.69–0.90)***

Ref.

1.25 (1.11–1.40)***

Vaginal deliveries (n = 178 993, 82.3 %)

Manual removal of placenta (n, %)

272 (1.4)

1921 (1.4)

263 (1.4)

OR (99 % CI)

0.99 (0.84–1.17)

Ref.

1.10 (0.92–1.30)

aOR (99 % CI)

1.01 (0.85–1.15)

Ref.

1.06 (0.90–1.26)

OASIS (n, %)

154 (0.8)***

1475 (1.0)

209 (1.2)

OR (99 % CI)

0.73 (0.59–0.91)***

Ref.

1.14 (0.94–1.37)

aOR (99 % CI)

0.78 (0.62–0.97)**

Ref.

1.10 (0.91–1.33)

  1. *** p < 0.001
  2. ** p < 0.01
  3. Maternal outcomes adjusted (aOR) with:
  4. 1) Blood transfusion and maternal age (categorical), parity (nulliparous or multiparous), birth weight (categorical), delivery mode (categorical)
  5. 2) MRP and maternal age (categorical), parity (nulliparous or multiparous), birth weight (categorical)
  6. 3) OASIS and maternal age (categorical), parity (nulliparous or multiparous), birth weight (categorical), vacuum extraction assisted delivery (vacuum extraction yes/no)
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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