56 Chapter 3 Table 1: Maternal demographic and anthropometric characteristics of all women and per indication for antenatal CTG Total women n= 1584 (%) Total aCTGsa n= 1795 Reduced fetal movements n= 1211 (%) External cephalic version n= 249 (%) Postdate pregnancy n= 335 (%) Maternal age (years), mean (SD) 31.1 (4.6) 30.6 (4.7) 31.9 (4.1) 32.3 (4.3) missing 3 3 0 0 Maternal age (years) <20 18 (1.1) 24 (2.0) 0 (0.0) 0 (0.0) 20-36 1347 (85.2) 1047 (86.7) 207 (83.1) 268 (80.0) >36 216 (13.7) 137 (11.3) 42 (16.9) 67 (20.0) missing 3 3 0 0 Parity Nulliparous 959 (60.5) 721 (59.5) 173 (69.5) 199 (59.4) Multiparous 625 (39.5) 490 (40.5) 76 (30.5) 136 (40.6) BMI <18,5 35 (2.2) 28 (2.3) 9 (3.6) 7 (2.1) 18,5-25 966 (61.4) 682 (56.8) 168 (67.8) 225 (67.4) >25 572 (36.4) 491 (40.9) 71 (28.6) 102 (30.5) missing 11 10 1 1 Ethnicity Dutch 612 (68.6) 395 (61.6) 128 (85.9) 183 (80.3) Non-Dutch 280 (31.4) 246 (38.4) 21 (14.1) 45 (19.7) Missing 692 570 100 107 SES High 381 (24.1) 286 (23.7) 74 (29.7) 75 (22.6) Medium 687 (43.5) 537 (44.4) 115 (46.2) 125 (37.7) Low 511 (32.4) 386 (31.9) 60 (24.1) 132 (39.7) Missing 5 2 0 3 Gestational age at birth (weeks) mean (SD) (40+1) (1.3) 40+0 (1.3) 39+5 (1.2) 41+4 (0.3) missing 6 4 2 0 aCTG=antenatal cardiotocography aThe total number of CTGs is higher than the total number of pregnant women due to 11.1% of the pregnant women having>1 CTG in primary midwife-led care. BMI: body mass index
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