Skip to main content

Table 1 Descriptive statistics of PM2.5, BC and meteorological factors during the study

From: Effect of short-term exposure to particulate air pollution on heart rate variability in normal-weight and obese adults

Pollutants Na Mean ± SD Minimum 25th Medium 75th Maximum IQR
ambient PM2.5, μg/m3 1220 55.77 ± 52.72 3.00 16.00 40.00 76.00 276.00 60.00
ambient BC, μg/m3 1220 2.78 ± 2.34 0.16 0.93 2.10 4.07 10.33 3.14
personal PM2.5, μg/m3 23,167 28.05 ± 31.98 0.10 8.19 16.04 33.57 272.03 25.38
personal BC, μg/m3 23,182 1.80 ± 2.00 0.01 0.45 1.09 2.49 44.05 2.04
Noise (LAeqT), dB 23,185 55.69 ± 5.07 37.54 53.07 55.81 58.23 78.94 5.16
Temperature, °C 23,253 25.98 ± 3.71 9.24 23.84 26.24 28.66 37.16 4.82
Relative humidity, % 23,253 25.28 ± 8.90 6.47 18.69 23.03 30.27 75.60 11.58
  1. Abbreviations: PM2.5 fine particulate matter, BC black carbon, SD standard deviation, IQR interquartile range
  2. aObservation after removing for missing values and outliers