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Table 4 Rates of preterm delivery (PTD) and subtypes among non-immigrants, and immigrants by length of residence

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

  PTD Spontaneous PTDa Non-spontaneous PTDb
Births Cases By the length of residence (years) Cases By the length of residence (years) Cases By the length of residence (years)
  0-4 5-9 10-14 ≥15 Pc   0-4 5-9 10-14 ≥15 Pc   0-4 5-9 10-14 ≥15 Pc
Population group n n % % % % %   n % % % % %   n % % % % %  
Non-immigrants 868 832 45 438 5.2   31 492 3.6   13 946 1.6  
All immigrants 40 709 2753 6.8 6.4 6.4 7.3 8.8 <0.001 1935 4.8 4.8 4.4 4.6 5.7 0.089 818 2.0 1.6 2.0 2.7 3.1 <0.001
Immigrants by country of birth:   
 Iraq 5879 308 5.2 5.4 4.6 6.7 3.1 0.691 221 3.8 4.0 3.0 4.4 2.1 0.259 87 1.5 1.4 1.6 2.3 1.0 0.296
 Pakistan 10 096 774 7.7 7.0 7.2 7.7 9.3 0.001 493 4.9 4.9 4.5 4.5 5.6 0.256 281 2.8 2.1 2.7 3.2 3.7 <0.001
 Phillippines 5069 404 8.0 6.9 8.6 9.7 11.9 <0.001 297 5.9 5.3 6.4 7.2 6.6 0.066 107 2.1 1.6 2.2 2.5 5.4 <0.001
 Somalia 8094 407 5.0 5.0 4.4 5.3 12.8 0.026 252 3.1 3.4 2.4 2.7 7.7 0.857 155 1.9 1.6 2.0 2.7 5.1 <0.001
 Sri Lanka 5235 386 7.4 6.1 7.9 9.6 10.5 <0.001 273 5.2 4.5 5.5 5.8 8.4 0.006 113 2.2 1.5 2.4 3.8 2.2 0.003
 Vietnam 6336 474 7.5 9.3 6.8 5.7 6.8 0.001 399 6.3 8.2 6.1 4.3 5.0 <0.001 75 1.2 1.0 0.7 1.4 1.7 <0.001
  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 induced labor or by cesarean section.
  3. cχ2 test for trend by categories of length-of-residence.