29 Regional variations in childbirth interventions in the Netherlands Table 1. Maternal and neonatal characteristics of women by region GR FR DR OV FL GD UT NH ZH ZL NB LB Total n 19,441 22,568 15,875 42,869 17,461 71,286 52,893 105,948 139,573 11,327 84,187 31,302 Parity, % Nulliparous Multiparous 45.8 54.2 42.4 57.6 42.7 57.3 42.1 57.9 41.4 58.6 43.4 56.6 44.7 55.3 46.8 53.2 45.7 54.3 42.8 57.2 45.8 54.2 47.2 52.8 Maternal age, % <20 years 20-24 years 25-29 years 30-34 years 35-39 years ≥40 years 1.9 12.4 31.2 35.4 16.1 2.9 1.5 11.5 34.8 35.1 14.5 2.7 1.6 11.6 35.4 34.2 14.7 2.5 1.2 10.0 33.4 38.0 14.9 2.4 2.2 13.9 33.9 32.3 14.6 3.0 1.2 10.0 31.6 37.5 16.6 3.1 0.8 7.5 26.7 40.6 20.9 3.6 1.0 8.4 26.2 38.2 21.6 4.5 1.5 11.7 30.3 35.6 17.4 3.5 1.6 15.2 33.9 33.1 13.6 2.7 1.0 8.7 31.5 39.8 16.5 2.5 1.6 10.6 32.2 37.8 15.2 2.7 Ethnic background, % Dutch Non-Dutch 85.7 14.3 90.7 9.3 89.9 10.1 86.2 13.8 65.4 34.6 85.6 14.4 77.5 22.5 67.1 32.9 65.4 34.6 87.2 12.8 80.1 19.9 82.7 17.3 Urbanisation, % Urban Intermediate Rural 18.0 49.2 32.9 4.6 47.0 48.5 0.0 53.6 46.4 2.9 71.3 25.9 0.0 72.5 27.5 3.8 71.4 24.8 23.0 59.6 17.4 39.8 49.1 11.1 41.7 45.0 13.3 0.0 53.3 46.7 9.0 70.0 21.0 2.5 69.7 27.8 Socioeconomic status, % High (p ≥75) Medium (p 25-75) Low (p ≤25) 9.3 31.5 59.2 11.8 34.8 53.4 19.4 40.5 40.0 16.9 51.4 31.7 39.2 36.8 24.1 19.1 56.0 24.9 35.7 38.8 25.4 23.5 39.0 37.5 25.5 39.1 35.4 7.4 60.3 32.2 20.0 55.8 24.1 8.7 58.4 32.9 Gestational age (weeks), % 37+0 - 37+6 38+0 - 40+6 41+0 - 41+6 ≥42 8.7 71.5 17.9 1.8 8.3 71.7 18.1 1.9 9.2 72.5 16.9 1.4 8.6 72.1 17.4 1.8 8.4 73.1 16.9 1.6 6.7 71.6 19.3 2.3 5.8 71.2 20.7 2.3 6.6 72.2 19.0 2.2 7.6 72.8 18.3 1.4 6.5 71.6 19.4 2.5 7.3 72.4 18.5 1.8 8.8 73.9 16.5 0.8 Birth weight, % <2,3rd percentile <10th percentile >90th percentile >97,7th percentile 1.7 8.0 11.3 3.0 1.4 6.8 12.9 3.5 1.4 7.3 11.9 3.4 1.5 7.4 11.0 2.9 1.8 9.5 9.8 2.4 1.6 7.8 11.2 3.0 1.7 7.9 10.6 2.7 1.8 8.4 10.3 2.7 1.9 8.9 9.7 2.5 2.0 8.8 10.0 2.4 2.0 9.3 9.0 2.3 2.1 9.7 9.0 2.4 Percentage of missing data: 0.0% for maternal age, 0.4% for ethnic background, 1.1% for urbanisation, 2.5% for socioeconomic status, 0.2% for birth weight. 2
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