Joyce Molenaar

75 Predicting population-level vulnerability among pregnant women APPENDIX 2. Results Table 1. Characteristics of the study populations (including missing data) Original study population (objective 1, 2 and 3) All unique pregnancies 2017 – 2021 (objective 1) Total n = 4172 807.904 n (%) n (%) Individual characteristics Age 19-23 24-35 >35 Missing 306 (7.3) 3528 (84.6) 338 (8.1) - 43797 (5.4) 624292 (77.3) 135882 (16.8) 3933 (0.5) Ethnicity Non-Western Western Native Dutch Missing 420 (10.1) 343 (8.2) 3409 (81.7) - 170968 (21.2) 89970 (11.1) 546624 (67.7) 342 (<0.1) Paritya Nullipara Primipara, multipara Missing 1755 (42.1) 2410 (57.8) <10 (<0.2) 355979 (44.1) 449416 (55.6) 2509 (0.3) Asylum seeker status Yes No 39 (0.9) 4133 (99.1) 19582 (2.4) 788322 (97.6) Socioeconomic characteristics Educational level Low Moderate High Missing 328 (7.9) 1513 (36.3) 2303 (55.2) 28 (0.7) 80849 (10.0) 289681 (35.9) 340669 (42.2) 96705 (12.0) Household income Low Moderate High Missing 202 (4.8) 3348 (80.2) 591 (14.2) 31 (0.7) 60682 (7.5) 613979 (76.0) 103122 (12.8) 30121 (3.7) Socioeconomic position (occupational status) No income/receiving benefits Student Paid work Missing 532 (12.8) 82 (2.0) 3502 (83.9) 56 (1.3) 132780 (16.4) 24988 (3.1) 632685 (78.3) 17451 (2.2) Debts and payment arrears Yes No 45 (1.1) 4127 (98.9) 19357 (2.4) 788547 (97.6) Insufficient financial resources Yes No Missing 524 (12.6) 3267 (78.3) 381 (9.1) Permanent contract No Yes 1929 (46.2) 2243 (53.8) 433393 (53.6) 374511 (46.4) Full-time contract No Yes 1925 (46.1) 2247 (53.9) 653069 (80.8) 154835 (19.2) Lifestyle factors Smoking Yes No Missing 661 (15.8) 3315 (79.5) 196 (4.7) Alcohol use Yes (excessive) No Missing 418 (10.0) 3503 (84.0) 251 (6.0) Physical activity Less than recommended As recommended or more Missing 1696 (40.7) 2158 (51.7) 318 (7.6) 3

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