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Table 1 Description of the sample; unadjusted and adjusted odds ratios for the effect of each risk factor on late antenatal booking

From: Predictors of the timing of initiation of antenatal care in an ethnically diverse urban cohort in the UK

Risk factor

n

%

Unadjusted analysis

Adjusted analysis *

    

n = 20,135

n = 19,316

    

OR

[95% CI]

OR

[95% CI]

Self-Defined Ethnicity

British (White)

3,875

19.25

1.00

 

1.00

 
 

African (except Somali)

2,715

13.48

2.03

[1.83, 2.25]

1.56

[1.38, 1.77]

Somali

480

2.38

3.11

[2.56, 3.77]

1.58

[1.28, 1.96]

Caribbean

591

2.94

1.44

[1.20, 1.73]

1.33

[1.09, 1.61]

Eastern European

2,531

12.57

1.90

[1.71, 2.11]

1.49

[1.32, 1.69]

Other White

395

1.96

1.34

[1.08, 1.67]

1.04

[0.82, 1.32]

Bangladeshi (inc British)

2,867

14.24

1.55

[1.40, 1.72]

1.20

[1.07, 1.34]

Indian (inc British)

1,842

9.15

1.34

[1.19, 1.51]

1.11

[0.97, 1.26]

Pakistani (inc. British)

3,109

15.44

1.35

[1.22, 1.50]

1.16

[1.04, 1.29]

Other Asian

957

4.75

1.58

[1.37, 1.83]

1.16

[0.97, 1.40]

Other

685

3.4

1.64

[1.38, 1.94]

1.16

[0.98, 1.36]

Missing values

88

0.44

    

Age at booking (years)

<20

980

4.87

1.37

[1.20, 1.58]

1.32

[1.13, 1.54]

 

20-24

4,578

22.74

1.00

 

1.00

 

25-29

7,137

35.45

0.73

[0.67, 0.79]

0.75

[0.69, 0.82]

30-34

4,811

23.89

0.71

[0.65, 0.77]

0.72

[0.65, 0.79]

35-39

2,070

10.28

0.75

[0.68, 0.84]

0.68

[0.60, 0.78]

≥40

551

2.74

0.83

[0.69, 0.99]

0.71

[0.58, 0.88]

Missing values

8

0.04

    

Parity

No previous live births

9,815

48.75

1.10

[1.02, 1.18]

0.99

[0.92, 1.07]

1 previous live birth

5,517

27.4

1.00

 

1.00

 

2 previous live births

2,763

13.72

1.14

[1.04, 1.25]

1.17

[1.06, 1.30]

3 previous live births

1,167

5.8

1.34

[1.18, 1.52]

1.43

[1.24, 1.64]

4+ previous live births

854

4.24

2.06

[1.78, 2.39]

2.09

[1.77, 2.46]

Missing values

19

0.09

    

Woman’s occupation

Managerial/professional

2,444

12.14

1.00

 

1.00

 
 

Lower supervisory/technical

2,492

12

1.12

[0.99, 1.27]

1.01

[0.88, 1.15]

Semi-routine & routine

3,319

16.48

1.59

[1.42, 1.79]

1.15

[1.02, 1.31]

Self-employed

177

0.88

2.22

[1.63, 3.02]

1.52

[1.09, 2.11]

Housewife

6,968

34.61

1.85

[1.67, 2.05]

1.25

[1.11, 1.41]

Unclassifiable

4,735

23.52

2.34

[2.10, 2.60]

1.59

[1.42, 1.80]

Missing values

0

0

    

Language ability

English speaker

13,466

66.88

1.00

 

1.00

 

Non-English speaker

6,539

32.48

1.51

[1.42, 1.60]

1.39

[1.29, 1.50]

Missing values

130

0.65

    

Birthplace

Born in the UK

4,464

22.17

1.00

 

1.00

 

Born outside the UK

15,666

77.8

1.52

[1.41, 1.63]

1.33

[1.21, 1.46]

Missing values

5

0.02

    

Housing status

Owner-occupier

3,752

18.63

1.00

 

1.00

 

Rented

14,060

69.83

1.65

[1.52, 1.78]

1.36

[1.25, 1.48]

Temporary accommodation

344

1.71

2.54

[2.03, 3.18]

1.71

[1.35, 2.16]

Other

1,281

6.36

2.51

[2.20, 2.86]

1.94

[1.68, 2.22]

Missing values

698

3.47

    

Year of Booking

2008

6,476

32.16

1.00

 

1.00

 

2009

6,450

32.03

0.60

[0.56, 0.65]

0.62

[0.57, 0.66]

2010

6,775

33.65

0.45

[0.42, 0.49]

0.48

[0.44, 0.52]

2011

434

2.16

0.50

[0.41, 0.62]

0.53

[0.44, 0.66]

 

Missing values

0

0

    
  1. OR, Odds ratio; CI, Confidence interval.
  2. * Each variable adjusted for all other variables in the model.