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Table 3 Within-subject effect change between exposure and unexposed situations for two different types of fires: wood pallets and wood pallets with mattresses and electrical cords

From: Cardiovascular health effects following exposure of human volunteers during fire extinction exercises

Outcome Differenceawith pallet fuel Differenceawith mixed fuel Welch t-test p-value
LnRHI −0.1 ± 0.3 −0.3 ± 0.3 0.166
SDNN −9.3 ± 24.9 −9.8 ± 22.2 0.942
pNN50 −0.05 ± 0.1 −0.04 ± 0.1 0.879
RMSSD −14.2 ± 29.8 −14.1 ± 22.9 0.991
LF 12.8 ± 71.0 56.6 ± 74.2 0.075
HF −18.7 ± 71.0 −15.1 ± 54.7 0.857
LF/HF 0.2 ± 0.7 0.5 ± 1.0 0.174
SP −8.2 ± 12.4 1.6 ± 11.8 0.013
DP −3.3 ± 7.2 3.9 ± 10.5 0.012
AI.75 2.9 ± 7.8 1.6 ± 9,1 0.614
BL.HR 6.2 ± 6.7 8.1 ± 7.8 0.400
  1. LnRHI natural logarithm of the reactive hyperemia index, SDNN standard deviation of all NN intervals, pNN50 proportion of successive NN intervals differing by more than 50 milliseconds divided by total number of NN intervals, RMSSD square root of the mean squared differences of successive NN intervals, LF power in low frequency range (0.04–0.15 Hz) in ms2, HF power in high frequency range (0.15–0.4 Hz) in ms2, LF/HF ratio LF(ms2)/HF(ms2), SP systolic blood pressure (mmHg), DP diastolic blood pressure (mmHg), AI.75 augmentation index corrected for 75 bpm, HR baseline heart rate (bpm). Values are mean ± SD
  2. aAverage difference between the exposed and unexposed situations within each subject