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Table 1 Basic characteristics of the study participants by sex

From: AHRR cg05575921 methylation in relation to smoking and PM2.5 exposure among Taiwanese men and women

Variable Men (n = 488) Women (n = 460) P value
AHRR cg05575921 (beta-value) 0.7832 ± 0.0042 0.8376 ± 0.0023 < 0.0001
F2RL3 cg03636183 (beta-value) 0.6334 ± 0.0025 0.6514 ± 0.0016 < 0.0001
Smoking status    < 0.0001
 Never 279 (57.17%) 429 (93.26%)  
 Former 117 (23.98%) 18 (3.91%)  
 Current 92 (18.85%) 13 (2.83%)  
Area/PM2.5 levels (μg/m3)    0.7115
 North/26.53 163 (33.40%) 167 (36.30%)  
 North-center/30.06 81 (16.60%) 80 (17.39%)  
 Center/36.91 102 (20.90%) 87 (18.91%)  
 South/40.68 142 (29.10%) 126 (27.39%)  
Exercise    0.6106
 No 271 (55.53%) 263 (57.17%)  
 Yes 217 (44.47%) 197 (42.83%)  
Age (years) 50.1004 ± 0.5173 49.3391 ± 0.5108 0.2959
BMI (Kg/m2) 25.0637 ± 0.1507 23.5313 ± 0.1702 < 0.0001
Alcohol drinking    < 0.0001
 No 396 (81.15%) 452 (98.26%)  
 Former 32 (6.56%) 4 (0.87%)  
 Current 60 (12.30%) 4 (0.87%)  
Secondhand smoke exposure    0.3259
 No 426 (87.30%) 411 (89.35%)  
 Yes 62 (12.70%) 49 (10.65%)  
  1. Mean ± standard errors (SEs) represent continuous data and percentages (%) represent categorical data. The stated PM2.5 levels for each area are the mean concentrations from 2006–2011