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Table 3 Associations between Norwegian-born women’s country of first birth and adverse neonatal outcomes (1990–2016)

From: Country of first birth and neonatal outcomes in migrant and Norwegian-born parous women in Norway: a population-based study

  n births n cases Crude OR Adjusted OR Adjusted OR Adjusted OR
Adverse neonatal outcomes    (95% CI) (95% CI)* (95% CI) † (95% CI) ‡
Very preterm (22–31 weeks)§
 Norway 480,589 3592 1.00 1.00 1.00 1.00
 Other 5865 54 1.23 (0.94–1.62) 1.32 (1.01–1.74) 1.31 (1.00–1.72) 1.32 (1.00–1.73)
Moderately preterm (32–36 weeks)§
 Norway 495,060 18,063 1.00 1.00 1.00 1.00
 Other 6117 306 1.39 (1.22–1.58) 1.37 (1.20–1.57) 1.36 (1.19–1.55) 1.36 (1.19–1.55)
Post-term (≥42 weeks)§
 Norway 480,497 33,033 1.00 1.00 1.00 1.00
 Other 5815 291 0.71 (0.63–0.81) 1.23 (1.08–1.40) 1.23 (1.08–1.40) 1.23 (1.08–1.40)
Small for gestational age (SGA)
 Norway 501,753 37,174 1.00 1.00 1.00 1.00
 Other 6171 632 1.43 (1.30–1.56) 1.45 (1.33–1.59) 1.44 (1.31–1.57) 1.43 (1.31–1.57)
Large for gestational age (LGA)
 Norway 501,753 95,058 1.00 1.00 1.00 1.00
 Other 6171 834 0.67 (0.62–0.73) 0.73 (0.67–0.80) 0.74 (0.68–0.80) 0.74 (0.68–0.80)
Apgar score < 7 at 5 min
 Norway 514,799 9279 1.00 1.00 1.00 1.00
 Other 6205 187 1.69 (1.46–1.97) 1.62 (1.39–1.89) 1.61 (1.39–1.88) 1.61 (1.38–1.88)
Stillbirth
 Norway 514,799 1789 1.00 1.00 1.00 1.00
 Other 6205 31 1.44 (1.01–2.05) 1.69 (1.18–2.42) 1.67 (1.17–2.40) 1.69 (1.18–2.42)
Neonatal death within 28 days
 Norway 514,799 808 1.00 1.00 1.00 1.00
 Other 6205 12 1.23 (0.70–2.18) 1.59 (0.89–2.83) 1.58 (0.89–2.81) 1.59 (0.89–2.83)
  1. * Adjusted for year of birth, parity, maternal age and marital status
  2. † Adjusted for * and maternal education
  3. ‡ Adjusted for *, † and mother’s gross income
  4. § Weeks of gestation; term births were used as comparison group