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Table 1 Number of deliveries by primiparous women and explanatory factors by maternal country of birth: Denmark 2004–2015

From: Ethnic differences in the risk of caesarean section: a Danish population-based register study 2004–2015

Total number of deliveries by maternal country of birth Denmark n = 272,888 Ex. Yugoslavia n = 2699 Poland n = 2685 Turkey n = 1856 Iraq n = 1663 Germany n = 1500 Norway n = 1486 Sweden n = 1403 Romania n = 1346 China n = 1292
Maternal age at delivery (years)
 ≤ 24 19.9 33.3 19.2 33.2 51.9 12.0 10.4 8.5 17.1 10.1
 25–34 69.4 59.5 72.1 59.1 42.5 67.6 76.6 73.0 74.1 76.4
 ≥ 35 10.7 7.2 8.7 7.7 5.7 20.4 13.1 18.5 8.8 13.5
Gestational age at delivery (weeks)
 Preterm (22 + 0–36 + 6) 6.6 5.9 4.8 5.9 5.8 5.6 6.3 5.1 5.1 4.5
 Term (37 + 0–41 + 6) 87.5 88.7 89.8 88.5 90.0 89.2 87.3 88.5 92.1 91.5
 Postterm (≥ 42 + 0) 5.8 5.4 5.3 5.4 4.2 5.0 6.4 6.3 2.7 4.0
 Missing 0.1 0.1 0.1 0.2 0.1 0.2 0.0 0.1 0.1 0.0
BMI
 Underweight < 18.5 4.2 5.7 7.0 3.2 6.0 3.7 4.9 5.5 9.6 16.4
 Normalweight 18.5–24.9 62.3 70.3 70.8 58.6 61.9 69.5 74.4 76.6 69.0 70.5
 Overweight 25–29.9 19.3 13.9 14.3 20.1 19.1 16.7 14.3 11.4 14.7 7.1
 Obese ≥30 11.0 5.7 4.3 6.7 7.9 7.1 4.2 3.1 4.4 1.3
 Missing 3.3 4.4 3.6 11.4 5.1 3.1 2.3 3.5 2.3 4.6
Maternal height (mean) 168.5 166.1 166.8 163.3 161.7 168.7 168.8 168.3 164.7 161.9
 Missing 2.7 3.7 3.1 10.6 4.3 2.9 2.2 2.7 2.2 3.7
Diabetes
 No 97.2 96.9 97.4 94.2 95.2 97.5 98.0 98.9 96.7 93.9
 Yes 2.8 3.1 2.6 5.8 4.8 2.5 2.0 1.1 3.3 6.1
Gestational hypertensive disorders
 No 93.7 96.4 95.2 96.3 97.1 95.5 95.5 93.7 96.9 98.2
 Yes 6.3 3.6 4.8 3.7 2.9 4.5 4.5 6.3 3.1 1.8
Birthweight
 < 2500 g. 4.5 4.4 3.3 5.0 4.9 4.2 4.2 3.9 4.2 2.5
 2500–4500 g. 92.6 92.5 93.8 90.5 92.5 93.4 93.4 92.5 93.3 94.4
 > 4500 g. 1.9 1.7 1.6 2.0 0.8 1.5 1.4 2.2 1.2 2.2
 Missing 1.0 1.4 1.3 2.6 1.8 0.9 1.1 1.4 1.3 0.9
 Mean (g.) 3432.9 3405.7 3415.2 3362.7 3285.2 3406.7 3451.1 3444.9 3367.2 3443.6
Maternal education (years)
 < 10 16.0 24.4 5.3 34.3 46.4 5.4 3.6 4.2 2.8 7.0
 10–12 38.4 34.5 13.5 26.0 24.4 17.2 15.1 16.2 10.1 13.6
 > 12 44.5 22.1 18.9 12.3 10.9 35.4 47.9 41.7 18.9 34.1
 No information 1.1 19.0 62.4 27.4 18.2 42.0 33.4 37.9 68.2 45.3
Paternal origin
 Danish 90.7 14.0 30.1 4.5 4.2 59.2 78.1 76.0 23.3 35.3
 Immigrant/ descendant 6.0 77.0 65.3 87.5 82.1 36.8 19.6 20.6 72.6 60.8
 Missing 3.4 9.0 4.7 8.0 13.8 4.0 2.3 3.4 4.1 3.9
  1. Frequencies are given in percentages and in rounded estimates