Table 3 Impact of case mix factors on the different indicators

Age (years)

1.08 (1.07–1.09)

1.03 (1.02–1.03)

0.03 (0.03–0.04)

1.04 (1.03–1.04)

1.03 (1.03–1.04)

1.00 (0.99–1.01)

Born outside the EU

1.15 (1.07–1.24)

1.03 (0.91–1.17)

0.17 (0.09–0.25)

1.15 (1.07–1.24)

1.02 (0.94–1.10)

1.36 (1.28–1.45)

BMI

1.04 (1.04–1.04)

1.04 (1.04–1.05)

0.02 (0.01–0.02)

0.99 (0.98–1.00)

1.01 (1.00–1.01)

1.02 (1.01–1.03)

Nulliparity

4.23 (3.89–4.59)

1.15 (1.03–1.29)

1.35 (1.25–1.46)

6.14 (5.46–6.92)

1.65 (1.55–1.75)

1.84 (1.70–1.98)

Previous CS

20.47 (18.88–22.20)

0.69 (0.63–0.77)

0.73 (0.65–0.80)

5.90 (5.17–6.72)

1.60 (1.46–1.74)

2.40 (2.15–2.67)

Non-cephalic presentation

66.97 (53.39–84.01)

0.25 (0.20–0.32)

0.37 (0.23–0.50)

0.79 (0.33–1.86)

1.02 (0.89–1.17)

1.37 (1.18–1.58)

Multiple birth

3.61 (2.99–4.36)

2.40 (1.81–3.19)

1.45 (1.22–1.69)

0.56 (0.31–1.02)

3.24 (2.79–3.76)

1.76 (1.36–2.27)

Premature (w32 + 0–w36 + 6)

2.02 (1.67–2.45)

0.57 (0.45–0.73)

2.09 (1.81–2.37)

0.22 (0.17–0.30)

0.82 (0.73–0.92)

1.04 (0.90–1.20)

Cervical insufficiency

1.19 (0.85–1.66)

1.39 (0.98–1.99)

0.41 (–0.11–0.94)

0.91 (0.32–2.60)

1.33 (0.96–1.82)

1.62 (1.04–2.52)

Infection of amniotic sac

8.97 (5.19–15.50)

2.58 (1.85–3.61)

1.84 (1.37–2.32)

0.66 (0.34–1.30)

2.11 (1.63–2.73)

3.61 (2.35–5.57)

Pre-eclampsia

2.28 (2.05–2.53)

8.77 (7.30–10.52)

2.19 (1.87–2.52)

1.26 (1.10–1.45)

1.59 (1.38–1.83)

1.29 (1.15–1.46)

Post-term pregnancy

1.80 (1.64–1.98)

17.18 (11.69–25.25)

0.43 (0.36–0.50)

1.52 (1.37–1.68)

1.59 (1.44–1.76)

1.37 (1.25–1.51)

Gestational diabetes

1.69 (1.47–1.95)

2.45 (2.13–2.81)

0.69 (0.48–0.89)

1.27 (1.03–1.56)

1.03 (0.86–1.23)

1.09 (0.92–1.30)

Polyhydramnios

3.37 (2.64–4.30)

3.74 (3.10–4.52)

0.82 (0.56–1.07)

1.62 (0.78–3.35)

1.67 (1.38–2.01)

1.58 (1.25–2.00)

Oligohydramnios

1.68 (1.42–1.99)

19.82 (16.73–23.47)

0.41 (0.33–0.49)

0.85 (0.65–1.11)

1.02 (0.86–1.21)

1.23 (1.05–1.44)

Placenta praevia

9.19 (7.27–11.63)

0.80 (0.60–1.05)

1.42 (0.70–2.14)

1.01 (0.52–1.96)

4.12 (3.38–5.03)

1.76 (1.36–2.29)

Premature rupture of membranes

0.41 (0.33–0.51)

3.26 (2.47–4.29)

0.38 (0.06–0.69)

1.02 (0.73–1.43)

0.85 (0.72–1.00)

1.00 (0.81–1.25)

Bleeding during pregnancy

1.05 (0.95–1.16)

1.40 (1.25–1.57)

0.17 (0.10–0.23)

0.97 (0.81–1.17)

1.14 (1.00–1.31)

1.22 (1.05–1.41)

Herpes

1.12 (0.93–1.36)

1.41 (1.15–1.73)

0.16 (0.05–0.26)

1.01 (0.71–1.43)

0.69 (0.53–0.90)

1.70 (1.31–2.19)

Intrauterine growth restriction

1.33 (1.12–1.58)

2.42 (2.16–2.70)

0.47 (0.26–0.69)

0.66 (0.54–0.81)

0.77 (0.66–0.90)

0.83 (0.67–1.03)

Hepatosis

1.09 (0.91–1.30)

6.68 (5.66–7.88)

0.41 (0.27–0.56)

0.78 (0.51–1.22)

1.31 (1.08–1.60)

0.91 (0.69–1.21)

Placental abruption

46.24 (27.94–76.54)

0.57 (0.46–0.71)

0.43 (0.15–0.71)

2.16 (0.79–5.88)

2.70 (1.86–3.92)

1.76 (1.12–2.78)

Comorbidity index^a

1.38 (1.34–1.42)

1.35 (1.30–1.41)

0.27 (0.22–0.31)

0.98 (0.93–1.03)

1.12 (1.07–1.18)

1.37 (1.32–1.42)

Constant

0.001

0.014

0.038

0.004

0.017

0.015

n

132 863

132 863

132 863

109 024

131 135

120 072