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

Table 4 Multiple linear regression showing the association between mean PM_2.5 (μg/m3) from 2006–2011 and AHRR (cg05575921) methylation

Variable	Model 1		Model 2
Variable	β	P value	β	P value
PM_2.5	− 0.00115	< .001	− 0.00124	< .001
Sex (reference: women)
Men	− 0.01489	< .001	− 0.01416	< .001
Age	− 0.00023	0.083	− 0.00022	0.116
Alcohol Drinking (reference: no)
Former	− 0.01043	0.357	− 0.01494	0.238
Current	− 0.00534	0.473	− 0.00430	0.603
Exercise (reference: no)
Yes	− 0.00196	0.495	− 0.00183	0.545
BMI	− 0.00007	0.844	0.00003	0.942
SHS (reference: no)			–	–
Yes	− 0.00115	0.802	–	–

Model 1 included SHS in the analysis, model 2 excluded SHS from the analysis, SHS second-hand smoke

ISSN: 1868-7083