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Table 1 Summary statistics for heart rate variability (HRV) and 24-hr moving average ambient air pollutant measures (November 2000 to December 2009)

From: Structural equation modeling of parasympathetic and sympathetic response to traffic air pollution in a repeated measures study

  Average Median SD 5% 95% IQR
Air pollution measure
BC (μg/m3) 0.83 0.73 0.43 0.31 1.62 0.55
CO (ppm) 0.43 0.40 0.26 0.11 0.92 0.31
NO (ppm) 0.02 0.01 0.02 0.01 0.06 0.01
NO2 (ppm) 0.02 0.02 0.01 0.01 0.03 0.01
HRV measurea
ln(SDNN) 3.7 3.6 0.8 2.6 5.2 1.0
ln(r-MSSD) 3.5 3.2 1.1 2.1 5.6 1.5
ln(HF) 4.9 4.6 2.0 2.2 8.8 2.7
ln(LF) 4.8 4.6 1.6 2.6 8.0 2.0
ln(LF/HF) −0.1 0.0 1.1 −2.0 1.7 1.5
  1. alog transformed HRV measures; SDNN, 5-min SD of normal-to-normal intervals; r-MSSD, square root of the mean squared differences of successive normal-to-normal intervals; HF, high-fequency HRV; LF, low-frequency HRV; LF/HF, ratio of LF and HF.