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Table 5 Effect of PM 2.5 on HRV

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

  Unadjusted regression Adjusted regressiona
β 95% CI p-value β 95% CI p-value
SDNN b (msec) -0.31 (-0.54 ~ -0.08) 0.008 -0.20 (-0.46 ~ 0.07) 0.138
rMSSD b (msec) -0.28 (-0.52 ~ -0.04) 0.024 -0.20 (-0.49 ~ 0.08) 0.157
pNN10 (%) -0.16 (-0.26 ~ -0.06) 0.002 -0.16 (-0.28 ~ -0.05) 0.006
pNN20 (%) -0.14 (-0.24 ~ -0.04) 0.008 -0.13 (-0.25 ~ -0.01) 0.030
LF b (msec2) -0.59 (-1.07 ~ -0.11) 0.017 -0.43 (-0.98 ~ 0.13) 0.127
HF b (msec2) -0.80 (-1.40 ~ -0.20) 0.008 -0.76 (-1.46 ~ -0.05) 0.035
  1. a Adjusted for age, starting time of the day, season, sampling year, current smoking status, and second-hand smoke exposure.
  2. b The outcome measurements were natural log (ln)-transformed.