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Table 2 Air pollutants (annual average concentrations) and their distributions

From: Association between exposure to ambient air pollution and renal function in Korean adults

     Percentile Pearson’s correlation coefficients
Air pollutants Mean SD IQR 10th 25th 50th 75th 90th PM10 NO2 SO2 CO
PM10 (μg/m3) 52.5 5.8 10 46 47 53 57 60 1 0.52*** 0.40*** 0.63***
NO2 (ppb) 25.2 6.9 12 16 19 24 31 34 1 0.16*** 0.34***
SO2 (ppb) 5.5 1.1 1 4 5 5 6 7 1 0.28***
CO (ppm) 0.6 0.1 0.1 0.4 0.5 0.6 0.6 0.7 1
  1. SD standard deviation, IQR interquartile range, PM 10 particulate matter < 10 μm in diameter, NO 2 nitrogen dioxide, SO 2 sulfur dioxide, CO carbon monoxide
  2. *p < 0.05, **p < 0.01, ***p < 0.001