You are viewing the site in preview mode

Skip to main content

Advertisement

Table 3 Demographic and obstetric covariates by maternal country of birth, Norway 1990–2009

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

  Non-immigrants Immigrants
  n = 868 832 Pakistan n = 10 096 Somalia n = 8094 Vietnam n = 6336 Iraq n = 5879 Sri Lanka n = 5235 Philippines n = 5069
  % % % % % % %
Period of birth        
 1990-1998 46.1 40.4* 16.8* 38.8* 8.7* 37.7* 32.3*
 1999-2009 53.9 59.6 83.2 61.2 91.3 62.3 67.7
Age at migration  
 <20 years   38.5 17.0 40.4 16.3 15.4 11.1
 ≥20 years   61.5 83.0 59.6 83.7 84.6 88.9
Period of arrival  
 Before 1993   56.3 17.1 62.5 6.9 37.6 36.4
 1993 onwards   43.7 82.9 37.5 93.1 62.4 63.6
Maternal age (y)  
 <20 2.7 2.1* 3.1* 1.8* 3.6* 1.0* 0.9*
 20-24 17.3 27.8 20.6 20.6 22.7 15.5 13.3
 25-29 35.2 35.4 33.6 35.9 32.5 37.1 31.8
 30-34 30.6 23.2 26.5 27.1 26.9 32.0 33.0
 35-39 12.2 9.2 12.8 11.8 11.8 12.7 17.2
 ≥40 1.9 2.2 3.5 2.8 2.6 1.8 3.7
Parity  
 0 41.2 28.8* 23.4* 39.8* 35.6* 41.0 45.9*
 1 36.0 26.0 21.8 33.3 29.2 37.1 35.5
 ≥2 22.8 45.2 54.9 26.9 35.1 21.9 18.6
Education level  
 <12 years 56.3 58.5 60.7 67.0 42.9 64.6 37.0
 ≥12 years 43.6 7.3* 3.8* 13.8* 10.9* 15.1* 30.2*
 missing 0.1 34.3 35.4 19.2 46.2 20.2 32.7
Size of labor unit  
 <1500 37.6 1.5* 18.6* 11.7* 17.7* 23.1* 33.6*
 1500-2999 28.1 33.0 30.3 38.7 32.5 19.5 27.1
 ≥3000 34.3 65.4 51.2 49.6 49.8 57.3 39.3
Term gestational days, mean (SD)a 282 (9.0) 279* (9.0) 283* (9.3) 277* (9.3) 280* (8.7) 278* (9.7) 278* (9.0)
Gest.diabetes 0.7 3.4* 1.6* 1.5* 1.7* 5.4* 2.1*
Pregest. diabetes 0.5 1.6* 0.7 0.5 1.0* 1.8* 0.8*
Hypertensive disorder 5.2 3.9* 4.2* 1.8* 2.8* 3.7* 5.3
Abruptio placenta 0.5 0.4 0.5 0.5 0.4 0.6 0.5
Placenta previa 0.2 0.2 0.2 0.3 0.3 0.3 0.9*
SGAb 4.2 12.4* 8.5* 9.0* 6.9* 10.4* 5.3*
LGAc 6.3 2.5* 3.3* 2.3* 3.1* 3.1* 4.4*
Major birth defect 2.4 2.8* 2.7 1.6* 2.7 2.3 2.0
Smokingd  
 Yes 18.9 0.6* 1.6* 2.0* 2.1* 0.3* 3.4*
 No 61.6 62.1 62.9 71.0 69.6 69.2 72.5
 Not disclosed 19.5 37.3 35.4 27.0 28.3 30.5 24.1
  1. *Different from non-immigrants (χ2 test with P < 0.05).
  2. aTerm gestational days with standard deviation was calculated in term infants with spontaneous labor onset.
  3. bSGA, small-for-gestational age infant, 5th percentile.
  4. cLGA, large-for-gestational age infant, 95th percentile.
  5. dLGA, large-for-gestational age infant, 95th percentile.