Skip to main content

Table 2 Summary of PM 2.5 , HRV, and DNA methylation in boilermakers

From: Heart rate variability and DNA methylation levels are altered after short-term metal fume exposure among occupational welders: a repeated-measures panel study

  Mean (SD) Difference in Measurement p-valuea
Background Environment Welding exposure Welding – Background
Personal PM2.5 (mg/m3) 0.11 (0.14) 0.43 (0.34) 0.32 <0.0001
    Difference in Measurement  
  Pre-shift Post-shift Post-shift – Pre-shift p-valuea
Alu (%5mC) 29.4 (1.1) 29.5 (1.06) 0.10 0.396
LINE-1 (%5mC) 82.5 (1.7) 82.7 (1.7) 0.22 0.240
SDNN (msec) 48.2 (24.2) 37.8 (18.7) -8.7 <0.0001
rMSSD (msec) 26.5 (19.1) 21.1 (11.9) -4.45 0.001
pNN10 (%) 51.4 (22.0) 42.5 (22.1) -0.08 0.0002
pNN20 (%) 33.2 (22.6) 25.8 (20.8) -0.07 0.002
LF (msec2) 1019.4 (1289.0) 593.0 (561.9) -378.3 0.0003
HF (msec2) 454.6 (884.3) 194.6 (284.3) -228.9 0.001
  1. a Accounting for within subject correlation.