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Table 1 Demographic covariates in non-immigrants and in immigrants, by the length of residence, Norway 1990-2009

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

Non-immigrants Immigrants Immigrants by the length of residence (years)
Births (%) 868 832 (95.5%) 40 709 (4.5%) 20 074 (49.3%) 11 077 (27.2%) 4926 (12.1%) 4632 (11.4%)  
  0-4 5-9 10-14 ≥15  
  % % % % % % Pa
Country of origin   <0.001
Iraq   14.4 20.0 12.9 6.9 2.1  
Pakistan   24.8 19.0 22.1 31.2 49.5  
Philippines   12.5 14.6 11.6 10.4 7.2  
Somalia   19.9 22.3 24.5 14.4 4.2  
Sri Lanka   12.9 12.7 15.7 13.7 5.9  
Vietnam   15.6 11.4 13.2 23.3 31.0  
Period of birth   <0.001
1990-1998 46.1 29.5* 31.0 31.8 30.0 17.4  
1999-2009 53.9 70.5 69.0 68.2 70.0 82.6  
Age at migration   <0.001
<20 years   24.5 7.7 20.9 46.6 86.5  
≥20 years   75.1 92.3 79.1 53.4 13.5  
Period of arrival   <0.001
Before 1993   37.4 16.6 36.0 69.4 97.1  
1993 onwards   62.6 83.4 64.0 30.6 2.9  
Maternal age (y)   <0.001
<20 2.7 2.2* 2.8 1.6 1.9 1.0  
20-24 17.3 21.1 28.9 12.9 12.9 15.9  
25-29 35.2 34.5 37.4 35.0 23.9 31.7  
30-34 30.6 27.4 21.8 33.7 34.8 28.4  
35-39 12.2 12.1 7.6 14.2 21.6 17.0  
≥40 1.9 2.7 1.5 2.5 5.0 6.0  
Parity   <0.001
0 41.2 34.1* 46.6 18.7 21.9 29.9  
1 36.0 29.4 30.0 30.7 24.1 28.8  
≥2 22.8 36.5 23.3 50.6 54.0 41.3  
Education level   <0.001
<12 years 56.3 56.1* 44.5 62.8 74.5 70.9  
≥12 years 43.6 12.0 8.7 12.1 14.9 23.2  
missing 0.1 31.9 46.8 25.1 10.6 5.9  
Size of labor unit   <0.001
<1500 37.6 15.6* 21.4 12.7 8.6 5.0  
1500-2999 28.1 30.8 31.2 30.2 32.0 29.5  
≥3000 34.3 53.6 47.4 57.1 59.4 65.5  
  1. *Different from non-immigrants (χ2 test with P < 0.05). aAssociated to the length of residence (χ2 test with P < 0.05).