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 | |