Inhalable particulate matter and mitochondrial DNA copy number in highly exposed individuals in Beijing, China: a repeated-measure study

Table 4 Effect of ambient particles on mitochondrial DNA copy number^a at the end of the work shift, by group and on all subjects

		All subjects(obs=240) ^b,c			Office workers(obs=120)			Truck drivers(obs=120) ^d
		β	(95%CI)	p-value	β	(95%CI)	p-value	β	(95%CI)	p-value
Mitochondrial DNA Copy Number (%)
	Personal PM_2.5 (work hours)	0.001	(−0.003;0.006)	0.55	0.001	(−0.006;0.007)	0.81	0.005	(−0.002;0.012)	0.18
	Personal EC (work hours)	−0.059	(−0.011;-0.006)	0.03	−0.012	(−0.022;-0.002)	0.02	−0.004	(−0.010;0.003)	0.28
	Ambient PM₁₀ (1-day mean)	−0.005	(−0.011;0.002)	0.18	−0.004	(−0.012;0.004)	0.28	−0.003	(−0.011;0.004)	0.40
	Ambient PM₁₀ (2-day mean)	−0.006	(−0.014;0.002)	0.12	−0.006	(−0.012;0.003)	0.19	−0.002	(−0.012;0.008)	0.67
	Ambient PM₁₀ (5-day mean)	−0.017	(−0.029;-0.005)	0.01	−0.011	(−0.025;0.004)	0.15	−0.012	(−0.028;0.004)	0.14
	Ambient PM₁₀ (8-day mean)	−0.008	(−0.043;-0.008)	0.004	−0.030	(−0.051;-0.008)	0.007	−0.012	(−0.036;0.013)	0.35

^a Adjusted for age, sex, BMI, smoking status (never, former, current), pack-years of smoking, and work hours per week.
^b Adjusted for group, age, sex, BMI, smoking status (never, former, current), pack-years of smoking, and work hours per week.
^c For PM_2.5 exposure, statistics are estimated on 239 observations because of a missing value in truck drivers group in work day 2.
^d For PM_2.5 exposure, statistics are estimated on 119 observations because of a missing value in work day 2.

ISSN: 1743-8977