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Table 1 Characteristics and exposure-levels of the study participants

From: Effects of airborne pollutants on mitochondrial DNA Methylation

Study   Characteristics High exposure Low exposure
Study 1 Exposure to metal-rich particulate matter (PM)    High-exposed steel workers (n = 20) Controls (n = 20)
Participants Age [Years], mean ± SD 42.5 ± 7.7 37.6 ± 2.8
  Ex/current smokers, n (%) 12 (60) 14 (70)
Exposure (PM1, μg/m3) Mean ± SD 9.2 ± 2.4 2.5 ± 0.7
Range [7.6; 11.8] [1.7; 3.8]
Study 2 Exposure to air benzene    Gas-station attendants (n = 20) Controls (n = 20)
Participants Age [Years], mean ± SD 39.9 ± 11.2 39.7 ± 10.4
  Ex/current smokers, n (%) 7 (35) 5 (25)
Exposure (Benzene, μg/m3) Mean ± SD 78.6 ± 42.5 7.0 ± 5.5
Range [31.2; 180.1] [4.2; 23.0]
Study 3 Exposure to traffic-derived elemental carbon    Truck drivers (n = 20) Controls (n = 20)
Participants Age [Years], mean ± SD 35.2 ± 5.1 33.4 ± 5.9
  Ex/current smokers, n (%) 8 (40) 6 (30)
Exposure (Elemental Carbon, μg/m3) Mean ± SD 21.3 ± 4.7 13.4 ± 2.1
Range [16.6; 35.6] [7.8; 16.1]
  1. SD: standard deviation.
  2. Only male participants were selected in the present study.