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Table 1 Characteristics of the study population in rural and in urban areas in 2008/2009

From: Air pollution and subclinical airway inflammation in the SALIA cohort study

  Total area (N = 402) Rural area (N = 190) Urban area (N = 212) p-Valuea
Age (means (sd)) 74.1 (2.6) 74.0 (2.5) 74.2 (2.6) 0.3259
Years of schooling (%)     0.8655
  <10 17.0 18.1 16.1  
  =10 51.0 50.5 51.2  
  >10 32.0 31.4 32.7  
Smoking (%)     0.0125
  Current 3.0 1.1 4.7  
  Former 15.7 12.1 18.9  
  Never 81.3 86.8 76.4  
Current passive smoking (%) 38.6 36.8 40.3 0.4797
Exposure to indoor mould (%) 12.7 8.9 16.0 0.0330
Asthmab (%) 9.7 8.5 10.9 0.4214
COPDb (%) 3.2 3.1 3.3 0.9351
Chronic bronchitisb (%) 11.0 11.6 10.5 0.7109
Change of home address (%) 14.2 11.1 17.0 0.0889
  1. ap-Value of t-test or Wilcoxon test for the difference of means between rural and urban area.
  2. bReported as doctor-diagnosed diseases.