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Table 2 Crude and adjusted c-section RRs of hospitals in group I

From: Risk adjustment models for interhospital comparison of CS rates using Robson’s ten group classification system and other socio-demographic and clinical variables

Hospital

n

Crude RR

p–value

Adj* RR

p–value

% variation†

A

707

0.94

0.638

1.08

0.555

14.9

B

397

0.99

0.953

1.12

0.467

13.1

C

268

0.42

0.003

0.47

0.008

11.9

D

107

0.70

0.303

0.74

0.386

5.7

E

448

1.48

0.002

1.53

<0.001

3.4

F

416

1.80

<0.001

1.77

<0.001

−1.7

G

508

0.92

0.586

1.02

0.887

10.9

H

112

1.17

0.543

1.26

0.333

7.7

I

305

1.60

0.001

1.73

<0.001

8.1

J

488

1.21

0.161

1.32

0.037

9.1

K

572

1.38

0.008

1.49

0.001

8.0

L

1,151

0.73

0.01

0.76

0.017

4.1

M

243

3.85

<0.001

2.43

<0.001

−36.9

N

143

2.55

<0.001

1.96

<0.001

−23.1

O

582

1.35

0.013

1.31

0.016

−3.0

P

616

1.44

0.001

1.51

<0.001

4.9

Q

1,177

0.30

<0.001

0.34

<0.001

13.3

R

1,239

1.12

0.272

1.22

0.043

8.9

S

99

3.31

<0.001

2.62

<0.001

−20.8

T

69

3.66

<0.001

2.57

<0.001

−29.8

U

1,382

1.95

<0.001

1.84

<0.001

−5.6

V

1,333

0.80

0.047

0.83

0.095

3.7

W

1,284

1.19

0.081

1.30

0.007

9.2

X

1,965

2.47

<0.001

2.21

<0.001

−10.5

Y

564

1.33

0.021

1.28

0.036

−3.8

  1. * Adjusted for: age, citizenship, severe co-morbid illness of the mother, HIV, diabetes, hypertension, ante-partum haemorrhage/abruption placentae/placenta praevia, eclampsia/pre-eclampsia, foetal-pelvic disproportion/excessive development of the infant, foetal anomalies, RH-isoimmunisation, polyhydramnios, oligohydramnios, abortion threats/assisted fecundation, congenital malformation, intrauterine growth retardation, post-maturity and macrosomia.
  2. † The % variation is computed as (crude RR-adj RR)*100/crude RR.