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Table 5 Adjusted relative risk (RR) of preterm delivery (PTD) and subtypes among immigrants (n = 40 709)

From: Preterm subtypes by immigrants’ length of residence in Norway: a population-based study

  PTD Spontaneous PTDa Non-spontaneous PTDb
  Adjusted demographic factorsc Adjusted demographiccand health factorsd Adjusted demographic factorsc Adjusted demographiccand health factorsd Adjusted demographic factorsc Adjusted demographiccand health factorsd
  aRR [95% CI] aRR [95% CI] aRR [95% CI] aRR [95% CI] aRR [95% CI] aRR [95% CI]
Length of residence (years)       
0-4 (Reference) 1.00 1.00 1.00 1.00 1.00 1.00
5-9 0.97 [0.88-1.06] 0.93 [0.85-1.02] 0.90 [0.80-1.01] 0.89 [0.80-1.00] 1.15 [0.96-1.38] 1.05 [0.88-1.25]
10-14 1.00 [0.88-1.14] 0.93 [0.83-1.05] 0.86 [0.74-1.00] 0.83 [0.72-0.97] 1.43 [1.15-1.78] 1.17 [0.94-1.67]
≥15 1.22 [1.08-1.38] 1.10 [0.98-1.24] 1.07 [0.92-1.24] 1.03 [0.90-1.20] 1.68 [1.34-2.10] 1.28 [1.02-1.61]
P trend 0.012 0.391 0.883 0.516 <0.001 0.018
Country of birth       
Iraq (Reference) 1.00 1.00 1.00 1.00 1.00 1.00
Pakistan 1.29 [1.12-1.48] 1.26 [1.10-1.45] 1.16 [0.99-1.37] 1.20 [1.02-1.42] 1.57 [1.21-2.04] 1.37 [1.06-1.76]
Phillippines 1.41 [1.22-1.64] 1.32 [1.14-1.53] 1.48 [1.24-1.76] 1.43 [1.19-1.70] 1.25 [0.94-1.68] 1.08 [0.81-1.44]
Somalia 0.95 [0.82-1.10] 0.89 [0.77-1.03] 0.82 [0.69-0.98] 0.82 [0.68-0.98] 1.26 [0.97-1.64] 1.07 [0.83-1.38]
Sri Lanka 1.31 [1.13-1.52] 1.29 [1.11-1.50] 1.32 [1.10-1.58] 1.34 [1.11-1.60] 1.27 [0.95-1.69] 1.20 [0.90-1.59]
Vietnam 1.26 [1.09-1.46] 1.38 [1.19-1.59] 1.53 [1.28-1.81] 1.60 [1.35-1.89] 0.64 [0.47-0.89] 0.81 [0.59-1.12]
  1. aSpontaneous PTD included births <37 completed gestational weeks with spontaneous labor onset or with prelabour rupture of membranes.
  2. bNon-spontaneous PTD included births <37 completed gestational weeks with onset by inducted labor or by cesarean section.
  3. cDemographic factors included the length of residence, country of birth, year of delivery, maternal age at delivery, parity and size of labor unit.
  4. dHealth factors included gestational and pre-gestational diabetes, hypertensive disorders, placenta disorders, major birth defects, maternal smoking and small- and large-for-gestational age infants.
  5. Bold text indicates significant difference relative to the reference.