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Table 6 Crude and adjusted c-section RRs of hospitals in groups V–X

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†

Adj‡ RR

p–value

% variation†

A

529

1.11

<0.001

1.09

<0.001

−1.8

1.11

<0.001

0.0

B

251

1.17

<0.001

1.14

<0.001

−2.6

1.13

<0.001

−3.4

C

168

1.14

<0.001

1.12

<0.001

−1.8

1.12

<0.001

−1.8

D

45

1.10

0.202

1.07

0.271

−2.7

1.02

0.729

−7.3

E

286

1.07

0.057

1.06

0.046

−0.9

1.06

0.027

−0.9

F

348

1.01

0.760

1.03

0.285

2

1.00

0.984

−1.0

G

270

1.10

0.006

1.11

<0.001

0.9

1.13

<0.001

2.7

H

102

1.18

<0.001

1.15

<0.001

−2.5

1.15

<0.001

−2.5

I

295

1.20

<0.001

1.15

<0.001

−4.2

1.09

<0.001

−9.2

J

435

1.11

<0.001

1.13

<0.001

1.8

1.09

<0.001

−1.8

K

308

1.02

0.650

1.05

0.145

2.9

1.05

0.074

2.9

L

1,123

0.77

<0.001

0.90

<0.001

16.9

0.91

<0.001

18.2

M

113

1.13

0.004

1.19

<0.001

5.3

1.12

<0.001

−0.9

N

89

1.06

0.277

1.05

0.311

−0.9

1.00

0.954

−5.7

O

338

0.99

0.850

1.08

0.014

9.1

1.04

0.143

5.1

P

334

1.09

0.004

1.15

<0.001

5.5

1.15

<0.001

5.5

Q

833

1.08

0.002

1.11

<0.001

2.8

1.11

<0.001

2.8

R

927

1.12

<0.001

1.20

<0.001

7.1

1.23

<0.001

9.8

S

212

1.21

<0.001

1.30

<0.001

7.4

1.28

<0.001

5.8

T

82

1.25

<0.001

1.16

<0.001

−7.2

1.12

0.001

−10.4

U

1,151

0.97

0.234

0.99

0.626

2.1

1.00

0.810

3.1

V

975

1.11

<0.001

1.14

<0.001

2.7

1.09

<0.001

−1.8

W

1,237

1.02

0.447

1.05

0.015

2.9

1.03

0.157

1.0

X

1,307

1.11

<0.001

1.19

<0.001

7.2

1.14

<0.001

2.7

Y

298

1.10

0.004

1.15

<0.001

4.5

1.13

<0.001

2.7

  1. * Adjusted for Robson group.
  2. † The % variation is computed as (crude RR-adj RR)*100/crude RR.
  3. ‡ 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, polyhydramnios, oligohydramnios, premature rupture of the membranes, abortion threats/assisted fecundation, congenital malformation, intrauterine growth retardation, post-maturity and macrosomia, multiple pregnancy, previous CS, cephalic/breech presentation.