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Table 1 Baseline characteristics of pregnant women in CPRD (UK), SAIL (Wales) and SMR (Scotland) in 2018

From: Epidemiology of pre-existing multimorbidity in pregnant women in the UK in 2018: a population-based cross-sectional study

Characteristics

Frequency (percentage)

CPRD (UK)

SAIL (Wales)

SMR (Scotland)

Total

37,641

27,782

6099

Nation

 England

13,075

(34.74%)

 Northern Ireland

2984

(7.93%)

 Scotland

12,559

(33.37%)

 Wales

9023

(23.97%)

Age categories (5 yearly)

 15–19

2534

(6.73%)

1537

(5.53%)

422

(6.92%)

 20–24

6604

(17.54%)

5360

(19.29%)

1147

(18.81%)

 25–29

10,204

(27.11%)

8617

(31.02%)

1830

(30.00%)

 30–34

10,723

(28.49%)

8081

(29.09%)

1746

(28.63%)

 35–39

5970

(15.86%)

3549

(12.77%)

803

(13.17%)

 40–44

1428

(3.79%)

603

(2.17%)

138

(2.26%)

 45–49

178

(0.47%)

35

(0.13%)

13

(0.21%)

Gravidity

 1

11,480

(30.50%)

13,006

(46.81%)

1800

(29.51%)

 2

9895

(26.29%)

9972

(35.89%)

1992

(32.66%)

 3

6734

(17.89%)

3252

(11.71%)

1105

(18.12%)

 4

4004

(10.64%)

1035

(3.73%)

580

(9.51%)

  ≥ 5

5528

(14.69%)

517

(1.86%)

618

(10.13%)

 Missing

4

(0.07%)

Ethnicity

 Asian / South Asiansa

1261

(3.35%)

418

(1.50%)

149

(2.44%)

 Black

973

(2.58%)

178

(0.64%)

23

(0.38%)

 Mixed

305

(0.81%)

121

(0.44%)

8

(0.13%)

 Other

528

(1.40%)

229

(0.82%)

91

(1.49%)

 White

20,818

(55.31%)

17,430

(62.74%)

4903

(80.39%)

 Missing

13,756

(36.55%)

9406

(33.86%)

925

(15.17%)

BMI (kg/m2)

 Underweight (< 18.5)

1217

(3.23%)

1287

(4.63%)

92

(1.51%)

 Normal Weight (18.5–24.9)

14,440

(38.36%)

9485

(34.14%)

1478

(24.23%)

 Overweight (25–29.9)

8075

(21.45%)

5658

(20.37%)

1010

(16.56%)

 Obese (30+)

7178

(19.07%)

5372

(19.34%)

1279

(20.97%)

 Missing

6731

(17.88%)

5980

(21.52%)

2240

(36.73%)

Smoking

 Non-Smoker

22,395

(59.50%)

10,151

(36.54%)

3349

(54.91%)

 Ex-smoker

5707

(15.16%)

8022

(28.87%)

863

(14.15%)

 Smoker

8237

(21.88%)

6612

(23.80%)

1041

(17.07%)

 Missing

1302

(3.46%)

2997

(10.79%)

846

(13.87%)

Patient level deprivation quintiles (IMD)

Only available for Englandb

    

 1, least deprived

2326

(17.79%)

6455

(23.23%)

722

(11.84%)

 2

1835

(14.03%)

5460

(19.65%)

1039

(17.04%)

 3

1878

(14.36%)

4779

(17.20%)

979

(16.05%)

 4

1853

(14.17%)

4032

(14.51%)

1253

(20.54%)

 5, most deprived

1908

(14.59%)

3832

(13.79%)

1344

(22.04%)

 Missing

3275

(25.05%)

3224

(11.60%)

762

(12.49%)

  1. a South Asian for CPRD, Asian for SAIL and SMR
  2. b Aggregate IMD quintiles cannot be provided for UK as each nation has its specific IMD; data presented here is patient level IMD for England only (n = 13,075). Practice level IMD for all four UK nations in CPRD is available in Additional Table 1
  3. BMI body mass index, CPRD Clinical Practice Research Datalink, IMD Index of Multiple Deprivation, SAIL The Secure Anonymized Information Linkage databank, SMR Scottish Morbidity Records