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Table 2 Crude primary c-section ORs by all variables and adjusted ORs by the variables included in the full and the parsimonious model

From: Risk adjustment for inter-hospital comparison of primary cesarean section rates: need, validity and parsimony

VARIABLE

Total n.

% of total

Crude OR

p

Full Model

Parsimonious model

     

Adj. OR

p

Adj. OR

p

Variables from mothers' discharge records

AGE, yrs

        

   29–33

5.648

37.17

ref.

 

ref.

 

ref.

 

   <= 17

35

0.23

0.6

0.001

0.5

0.005

0.5

0.002

   18–20

276

1.82

0.7

< 0.001

0.8

0.006

0.7

< 0.001

   21–24

1.051

6.92

0.8

< 0.001

0.8

< 0.001

0.8

< 0.001

   25–28

2.657

17.48

0.9

< 0.001

0.9

0.004

0.9

< 0.001

   34–38

4.203

27.66

1.2

< 0.001

1.1

< 0.001

1.2

< 0.001

   >=39

1.327

8.73

1.7

< 0.001

1.7

< 0.001

1.8

< 0.001

Marital status

        

   Married

6.700

44.09

ref.

 

ref.

 

ref.

 

   Divorced/separated

190

1.25

1.3

0.001

1.2

0.082

1.2

0.162

   Not declared

1.124

7.40

1.0

0.224

1.1

0.048

1.1

0.011

   Single

2.948

19.40

1.1

< 0.001

1.2

< 0.001

1.2

< 0.001

   Widow

13

0.09

1.0

0.916

1.0

0.906

1.0

0.866

Citizenship

        

   Italian

12.908

84.94

ref.

 

ref.

   

   Non developing countries excluding Italy

2.193

14.43

0.9

0.489

0.8

0.103

  

Developing countries

96

0.63

0.8

< 0.001

0.8

< 0.001

  

Region of residence:

        

   RER

14.016

92.23

1.0

 

ref.

   

   Other region

1.181

7.77

0.8

< 0.001

0.7

< 0.001

  

Diabetes

239

1.57

3.9

< 0.001

3.1

< 0.001

  

Hypertension

505

3.32

3.4

< 0.001

3.8

< 0.001

  

Lung disease

44

0.29

7.3

< 0.001

5.7

< 0.001

  

HIV

38

0.25

19.9

< 0.001

28.3

< 0.001

  

Other severe co-morbid illness of the mother

187

1.23

4.4

< 0.001

5.1

< 0.001

  

Eclampsia or pre-eclampsia

870

5.72

9.0

< 0.001

9.1

< 0.001

8.5

< 0.001

Antepartum hemorrhage/abruptio placentae/placenta previa/

673

4.43

57.0

< 0.001

75.1

< 0.001

62.0

< 0.001

Polyhydramnios

85

0.56

5.6

< 0.001

4.3

< 0.001

  

Oligohydramnios

946

6.22

2.2

< 0.001

2.9

< 0.001

  

Premature rupture of membranes

1.563

10.28

0.7

< 0.001

-

-

  

Other problems of the amnios

25

0.16

9.8

< 0.001

10.2

< 0.001

  

Cord prolapse

33

0.22

52.0

< 0.001

70.3

< 0.001

  

Abortion threads/assisted fecundation/supervision of high risk pregnancy

89

0.59

6.5

< 0.001

4.3

< 0.001

  

Pre-term delivery

355

2.34

2.2

< 0.001

-

-

  

Post-term delivery

424

2.73

0.8

0.001

1.4

< 0.001

  

Malposition and malpresentation of fetus

3.093

20.35

124.9

< 0.001

155.5

< 0.001

145.9

< 0.001

Fetopelvic disproportion/excessive development of the infant

772

5.08

8.6

< 0.001

14.1

< 0.001

13.1

< 0.001

Fetal abnormality

127

0.84

5.1

< 0.001

3.9

< 0.001

  

Rh-isoimmunization

138

0.91

0.7

< 0.001

-

-

  

Variables from neonatal discharge record

Infant birth weight (grams)

        

   > 2500

12.753

83.92

ref.

 

ref.

 

ref.

 

   550–1499

353

2.32

18.6

< 0.001

5.7

< 0.001

15.0

< 0.001

   1500–2499

2.040

13.42

6.1

< 0.001

2.6

< 0.001

5.5

< 0.001

Congenital malformation

781

5.14

2.0

< 0.001

1.5

< 0.001

  

Post-maturity or macrosomia

132

0.87

1.8

< 0.001

-

-

  

Variables from both neonatal and maternal discharge records

Intrauterine growth retardation

953

6.27

4.77

< 0.001

2.2

< 0.001

  

Multiple pregnancy

1.323

8.71

17.29

< 0.001

9.8

< 0.001

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