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Table 2 Odds ratios from univariate regression model of OASIS vs. risk factors

From: Can the risk of obstetric anal sphincter injuries (OASIs) be predicted using a risk-scoring system?

Variable

95% CI

OR

Subgroup

p-value

Maternal age in years

0.99-1.02

1.01

 

0.415

Ethnicity

-

1

Caucasian

-

1.75-2.74

2.19

South Asian

< 0.001

0.60-0.95

0.76

Afro-Caribbean

0.019

1.05-3.65

1.96

East Asian

0.035

0.97-1.55

1.23

Other

0.082

Multiparity

0.34-0.45

0.39

 

< 0.001

Smoking status

-

1

Non-smoker

-

0.77-1.35

1.01

Ex-smoker

0.891

0.21-0.46

0.31

Smoker

< 0.001

Place of delivery

-

1

Hospital

-

0.08-0.60

0.22

Home

0.003

0.37-3.77

1.18

Other

0.779

Mode of delivery

-

1

Vaginal

-

5.08-8.94

6.74

Forceps

< 0.001

1.92-3.10

2.44

Ventouse

< 0.001

Epidural

-

1

No

-

1.24-1.94

1.55

Yes

< 0.001

Other analgesia

-

1

None

-

0.30-5.13

1.24

CSE

0.766

5.59-11.87

8.14

Spinal

< 0.001

0.23-12.89

1.71

Epidural

0.605

1.42-2.62

1.93

Water immersion

< 0.001

Duration of 2nd stage in minutes

1.05-1.08

1.07

 

< 0.001

Water birth

0.74-2.20

1.27

 

0.378

Shoulder dystocia

-

1

No

-

2.34-5.10

3.46

Yes

< 0.001

Mediolateral episiotomy

-

1

No

-

2.14-3.08

2.57

Yes

< 0.001

Birth weight (grams)

1.0004-1.0008

1.0006

 

< 0.001

Head circumference (mm)

1.11-1.23

1.16

 

< 0.001