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Table 1 General characteristics of study participants (2008–2015)

From: Methylation at cg05575921 of a smoking-related gene (AHRR) in non-smoking Taiwanese adults residing in areas with different PM2.5 concentrations

Variable Men Women   All participants
n = 279 n = 429 P value n = 708
cg05575921 (β value) 0.84260 ± 0.03740 0.82650 ± 0.03920 < .001 0.83626 ± 0.03892
Area    0.833  
 Northern 92 (32.97%) 152 (35.43%)   244 (34.46%)
 North-Central 46 (16.49%) 75 (17.48%)   121 (17.09%)
 Central 54 (19.35%) 80 (18.65%)   134 (18.93%)
 Southern 87 (31.18%) 122 (28.44%)   209 (29.52%)
Age (years) 49.42 ± 11.76 49.49 ± 10.97 0.926 49.46 ± 11.28
Alcohol Drinking    < .001  
 No 251 (89.96%) 423 (98.60%)   674 (95.20%)
 Former 7 (2.51%) 3 (0.70%)   10 (1.41%)
 Current 21 (7.53%) 3 (0.70%)   24 (3.39%)
Exercise     
 No 157 (56.27%) 240 (55.94%) 0.931 397 (56.07%)
 Yes 122 (43.73%) 189 (44.06)   311 (43.93%)
BMI (kg/m2) 23.52 ± 3.57 24.95 ± 3.44 < .001 24.08 ± 3.59
SHS    0.598  
 No 251 (89.96%) 391 (91.14%)   642 (90.68%)
 Yes 28 (10.04%) 38 (8.86%)   66 (9.32%)
  1. Continuous variables are presented as mean ± SD while categorical variables are presented as numbers (%)
  2. SD standard deviation, SHS second-hand smoke