123 5 MATERNAL CHARACTERISTICS AS INDICATIONS FOR ROUTINE IOL 5 S 5 Table. Demographic characteristics (n, %) of the study population consisting of healthy pregnancies ≥37 weeks of gestation for the years 2012-2018. Pregnant at 37+0 weeks Pregnant at 38+0 weeks Pregnant at 39+0 weeks Pregnant at 40+0 weeks Pregnant at 41+0 weeks Pregnant at 42+0 weeks n Column % n Column % n Column % n Column % n Column % n Column % Mortality Total mortality 723 100 629 100 500 100 328 100 147 100 13 100 Total fetal mortality 515 71.23 435 69.16 328 65.6 206 62.80 91 61.90 6 46.15 Total neonatal mortality 208 28.77 194 30.84 194 34.4 123 37.20 56 38.10 7 53.85 Pregnancies Total pregnancies 603,833 100 579.942 100 515.014 100 3518.915 100 139.944 100 10.804 100 Ethnicity Dutch 464,243 77.85 446,089 77.88 397,673 78.16 279,860 78.85 109,678 78.08 8,062 74.93 Non Dutch 132,095 22.15 126,709 22.12 111,137 21.84 75,089 21.15 29,023 20.92 2,698 25.07 Parity P0 274,349 45.46 261,840 45.17 231,588 44.99 163,457 45.56 69,707 49.83 7,027 65.05 P1 218,477 36.20 211,030 36.40 188,033 36.53 128,603 35.85 45,118 32.25 2,160 20.00 P2 78,503 13.01 75,867 13.09 67,858 13.18 47,625 13.27 17,554 12.55 1,032 9.55 P3+ 32,222 5.34 30,940 5.34 27,307 5.30 19,083 5.32 7,513 5.37 583 5.40 Maternal age <25 years 62,571 10.36 59,546 10.27 51,774 10.05 34,839 9.71 13,039 9.32 941 8.71 25-29 years 195,293 32.35 186,916 32.23 165,164 32.07 113,347 31.58 42,805 30.59 2,982 27.61 30-34 years 237,073 39.27 228,404 39.39 204,059 39.63 143,329 39.94 55,970 40.00 4,303 39.84 35-39 years 95,112 15.75 91,817 15.83 82,169 15.96 58,856 16.40 24,451 17.47 2,196 20.33 ≥40 years 13,726 2.27 13,207 2.28 11,806 2.29 8,512 2.37 3,667 2.26 379 3.51 Socioeconomic status Low 153,723 25.76 147,279 25.70 129,527 25.45 88,648 24.98 34,124 24.63 2,648 24.69 Medium 285,373 47.82 273,975 47.80 243,516 47.84 170,242 47.98 66,492 48.00 5,228 48.75 6 High 157,609 26.41 151,877 26.50 135,954 26.71 95,925 27.04 37,916 27.37 2,849 26.56 Total missing data n (%): 5 (0.00) for total mortality and fetal mortality, 7490 (1.24) for ethnicity, 277 (0.05) for parity, 52 (0.01) for maternal age, and 7,123 20 (1.18) for socioeconomic status. 21 22
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