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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