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Table 2 Univariable analysis of clinical and socio-demographic factors associated with stillbirth (n = 53,293)

From: Ethnic variation in stillbirth risk and the role of maternal obesity: analysis of routine data from a London maternity unit

  

Total births

Stillbirths

Crude OR (95% CI)

p value

n = 53293

(%)

n = 329

(%)

  

Ethnicity

White

26,390

(49.5)

99

(30.1)

ref

 

Black

17,337

(32.5)

157

(47.7)

2.43 (1.88-3.13)

<0.001

Asian

2,957

(5.5)

27

(8.2)

2.45 (1.60-3.75)

<0.001

Other

5,790

(10.9)

40

(12.2)

1.85 (1.27-2.69)

0.001

Missing

813

(1.5)

6

(1.8)

  

Deprivation (IMD)

Quintile 1 (least deprived)

1,636

(3.1)

7

(2.1)

0.64 (0.30-1.37)

0.25

Quintile 2

3,056

(5.7)

16

(4.9)

0.78 (0.46-1.32)

0.36

Quintile 3

6,072

(11.4)

31

(9.4)

0.76 (0.51-1.14)

0.19

Quintile 4

23,997

(45.0)

151

(45.9)

0.94 (0.74-1.20)

0.64

Quintile 5 (most deprived)

18,147

(34.1)

121

(36.8)

ref

 

Missing

385

(0.7)

3

(0.9)

  

Maternal age

<20 yrs

2,041

(3.8)

11

(3.3)

0.84 (0.44-1.58)

0.58

20-24 yrs

7,217

(13.5)

39

(11.9)

0.84 (0.56-1.24)

0.38

25-29 yrs

12,125

(22.8)

78

(23.7)

ref

 

30-34 yrs

17,473

(32.8)

100

(30.4)

0.89 (0.65-1.20)

0.45

35-39 yrs

11,441

(21.5)

74

(22.5)

1.00 (0.73-1.39)

0.97

40+ yrs

2,996

(5.6)

27

(8.2)

1.40 (0.90-2.18)

0.13

Per year increase in age

    

1.02 (1.00-1.04)

0.039

BMI

Underweight

1,413

(2.7)

7

(2.1)

1.01 (0.47-2.16)

0.98

Recommended

24,423

(45.8)

120

(36.5)

ref

 

Overweight

10,503

(19.7)

70

(21.3)

1.36 (1.00-1.84)

0.046

Obese

6,339

(11.9)

61

(18.5)

1.97 (1.44-2.68)

<0.001

Missing

10,615

(19.9)

71

(21.6)

1.36 (1.02-1.83)

0.04

Parity

Nulliparous

30,856

(57.9)

168

(51.1)

1.03 (0.76-1.36)

0.85

Para 1

13,196

(24.8)

70

(21.3)

ref

 

Para 2+

9,170

(17.2)

 

(27.7)

1.88 (1.37-2.57)

<0.001

Missing

71

(0.1)

0

(0.0)

  

Single status

Married or living with partner

38,987

(73.2)

240

(72.9)

ref

 

Single

14,167

(26.6)

88

(26.7)

1.01 (0.79-1.29)

0.94

Missing

139

(0.3)

1

(0.3)

  

Smoking

Non-smoker at booking

44,205

 

278

(84.5)

ref

 

Smoker at booking

3,327

 

26

(7.9)

1.01 (0.79-1.29)

0.29

Missing

5,761

(10.8)

25

(7.6)

  

Hypertensive disorders

No hypertension

50,721

(95.2)

295

(89.7)

ref

 

Hypertension

2,572

(4.8)

34

(10.3)

2.29 (1.61-3.26)

<0.001

Diabetes

No diabetes

52,064

(97.7)

317

(96.4)

ref

 

Diabetes

1,229

(2.3)

12

(3.6)

1.61 (0.90-2.87)

0.11