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Table 4 HRV measurements of a subgroup on non-welding days (n = 49)

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
Pre-shift Post-shift Post-shift – Pre-shift
SDNN (msec) 45.4 (23.5) 45.5 (23.1) 1.9 0.32
rMSSD (msec) 26.5 (18.5) 26.4 (189.3) 0.69 0.65
pNN10 (%) 51.97 (22.0) 50.1 (22.9) -0.56 0.75
pNN20 (%) 34.1 (23.2) 32.1 (23.8) -0.65 0.7
LF (msec2) 850.3 (976.1) 853.4 (888.2) 60 0.43
HF (msec2) 427.6 (804.5) 407.4 (719.2) 3.23 0.97
  1. aAccounting for within subject correlation.