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Table 2 Relative mitochondrial DNA copy number (RMtDNAcn) by subjects' characteristics.

From: Airborne particulate matter and mitochondrial damage: a cross-sectional study

Variable n Mean RMtDNAcn* 95% CI*
Age, years    
   < 39 21 1.14 0.96 to 1.33
   39 - 47 21 1.29 1.10 to 1.47
   > 47 21 1.14 0.95 to 1.32
Body mass index, kg/m2    
   ≤25 21 1.25 1.07 to 1.44
   25 - 27.5 21 1.20 1.10 to 1.38
   > 27.5 21 1.12 0.93 to 1.30
Smoking duration, years    
   0 23 1.17 0.99 to 1.35
   0 - 19 19 1.17 0.98 to 1.36
   > 19 21 1.23 1.04 to 1.42
Duration of employment, years    
   < 9 20 1.27 1.08 to 1.46
   9 - 21 20 1.17 0.99 to 1.36
   > 21 19 1.15 0.96 to 1.34
Education    
   Primary school 12 1.28 1.07 to 1.48
   Middle school 37 1.19 1.01 to 1.36
   High school 14 1.12 0.92 to 1.32
Area of residence    
   Rural 12 1.24 1.05 to 1.42
   Suburbs 41 1.14 0.99 to 1.30
   City centre 8 1.21 1.00 to 1.41
Self-reported traffic intensity near home    
   Low 18 1.12 0.94 to 1.29
   Medium 38 1.19 1.03 to 1.35
   High 5 1.23 1.00 to 1.46
  1. * Based on measurements of DNA from blood samples taken on the first day of a working week (time 1) and after three consecutive days of work (time 2). As each study subject had two measurements of relative mitochondrial DNA copy number (RMtDNAcn), mixed regression models were used to account for within-subject correlation and estimate means and 95% confidence intervals (CI).