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

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

  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 PM2.5 (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
  1. a Adjusted for age, sex, BMI, smoking status (never, former, current), pack-years of smoking, and work hours per week.
  2. b Adjusted for group, age, sex, BMI, smoking status (never, former, current), pack-years of smoking, and work hours per week.
  3. c For PM2.5 exposure, statistics are estimated on 239 observations because of a missing value in truck drivers group in work day 2.
  4. d For PM2.5 exposure, statistics are estimated on 119 observations because of a missing value in work day 2.