Table 4. Change in methylation of NBL2 associated with 10% increase in inhaled elemental components ^a.

	Office Workers (obs=120)				Truck Drivers (obs=120)
	β	95%CI	p-value	FDR	β	95%CI	p-value	FDR
Inhaled elemental componentsb
Al	-0.077	(-0.219 ; 0.066)	0.291	0.810	0.096	(-0.007 ; 0.199)	0.067	0.180
Ca	0.023	(-0.092 ; 0.138)	0.692	0.810	0.065	(0.014 ; 0.115)	0.012	0.047
Fe	0.013	(-0.095 ; 0.121)	0.810	0.810	0.054	(-0.027 ; 0.135)	0.189	0.377
K	-0.056	(-0.181 ; 0.068)	0.375	0.810	0.035	(-0.046 ; 0.117)	0.396	0.528
S	0.020	(-0.046 ; 0.085)	0.554	0.810	-0.003	(-0.092 ; 0.087)	0.954	0.954
Si	0.010	(-0.063 ; 0.082)	0.795	0.810	0.121	(0.030 ; 0.212)	0.009	0.047
Ti	0.060	(-0.030 ; 0.151)	0.192	0.810	0.044	(-0.045 ; 0.133)	0.331	0.528
Zn	-0.024	(-0.092 ; 0.043)	0.479	0.810	-0.004	(-0.059 ; 0.051)	0.890	0.954

^aBased on 240 total observations (120 study days for office workers and 120 study days for truck drivers). P-values were obtained from GEE models, which were adjusted for occupation, PM_2.5, measure day, age, sex, BMI, number of cigarettes smoked during examination time and usage of central heating.

^bMeasured during the work hours of examination days using light-weight personal monitors.