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Table 1 Maternal and pregnancy characteristics of women in primary midwifery care at 28 weeks and beyond

From: Women’s characteristics and care outcomes of caseload midwifery care in the Netherlands: a retrospective cohort study

   National Caseload practices Matched controls p-value (caseload vs matched)
n = 127,818 n = 657 n = 1954
Maternal age         na a
  Mean 30.4 (SD 4.6) 31.6 (SD 4.5) 31.4 (SD 4.4)   
  < 25 13,197 (10.3%) 32 (4.9%) 99 (5.1%)   
  25–29 41,138 (32.2%) 192 (29.2%) 567 (29.0%)   
  30–34 49,438 (38.7%) 272 (41.4%) 814 (41.7%)   
  35–39 20,885 (16.3%) 132 (20.1%) 393 (20.1%)   
  ≥40 3160 (2.5%) 29 (4.4%) 81 (4.1%)   
Parity         na a
(missing: 2) 0 58,608 (45.8%) 319 (48.6%) 940 (48.1%)   
  1 46,010 (36.0%) 240 (36.5%) 722 (36.9%)   
  ≥2 23,198 (18.1%) 98 (14.9%) 292 (14.9%)   
Background         na a
  Dutch 96,589 (75.6%) 522 (79.5%) 1555 (79.6%)   
  Non Dutch 31,229 (24.4%) 135 (20.5%) 399 (20.4%)   
SES         0.019 b
(missing 574) 1 (low) 41,146 (32.3%) 237 (36.7%) 757 (39.0%)   
  2 (intermediate) 55,949 (44.0%) 248 (38.4%) 802 (41.4%)   
  3 (high) 30,149 (23.7%) 160 (24.8%) 380 (19.6%)   
Urbanisation         <  0.001 b
(missing 206) Very urban 31,693 (24.8%) 184 (28.1%) 539 (27.6%)   
  Urban 32,707 (25.6%) 193 (29.5%) 360 (18.4%)   
  Semi-urban 23,989 (18.8%) 65 (9.9%) 253 (13.0%)   
  Rural 21,991 (17.2%) 93 (14.2%) 467 (23.9%)   
  Very Rural 17,232 (13.5%) 119 (18.2%) 333 (17.1%)   
Gestational age at intake in practice        <  0.001 b
(missing 1206) ≤12 112,767 (89.1%) 480 (73.2%) 1770 (90.6%)   
  13–27 10,578 (8.4%) 101 (15.4%) 131 (6.7%)   
  28–36 2763 (2.2%) 57 (8.7%) 37 (1.9%)   
  ≥37 wk 506 (0.4%) 18 (2.7%) 3 (0.2%)   
Antenatally planned place of birth        <  0.001 b
(missing 3269) home 27,111 (21.8%) 291 (44.5%) 387 (20.3%)   
  birthcentre 12,666 (10.2%) 28 (4.3%) 87 (4.6%)   
  hospital 70,322 (56.5%) 272 (41.6%) 1177 (61.6%)   
  undecided 14,450 (11.6%) 63 (9.6%) 259 (13.6%)   
Gestational age at birth in weeks        <  0.001 b
(missing 1432) <  370 5121 (4.1%) 20 (3.1%) 80 (4.1%)   
  37–416 119,429 (94.5%) 601 (91.8%) 1829 (94.2%)   
  ≥420 1836 (1.5%) 34 (5.2%) 32 (1.6%)   
  Mean 39.3 (SD 1.5) 39.5 (SD 1.6) 39.3 (SD 1.5) 0.004 c
Birthweight (gram)          
(missing 796) Mean 3469 (SD 513) 3.495 (SD 499) 3.475 (SD 508) 0.382 c
  SGA (<p5) 4575 (3.6%) 26 (4.0%) 61 (3.1%) 0.302 b
  LGA (>p95) 5765 (4.5%) 26 (4.0%) 82 (4.2%) 0.790 b
Birthweight Categories        0.424 b
  < 2500 4267 (3.3%) 12 (1.8%) 52 (2.7%)   
  2500–4500 120,844 (94.7%) 630 (96.0%) 1863 (95.3%)   
  >  4500 2459 (1.9%) 14 (2.1%) 35 (1.8%)   
Multiple pregnancy   135 (0.1%) 1 (0.2%) 3 (0.2%)   
Non-vertex presentation at birth breech 3881 (3.0%) 15 (2.3%) 58 (3.0%)   
  other / unknown 2746 (2.1%) 8 (1.2%) 42 (2.1%)   
  1. anot applicable, matching variable
  2. bChi Square
  3. cTwo-sided t-test