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Table 3 Descriptive statistics for estimated long-term average air pollution concentrations at baseline

From: Long-term exposure to ambient ultrafine particles and respiratory disease incidence in in Toronto, Canada: a cohort study

Pollutant IQR Mean (SD) Min 5th 25th 50th 75th 95th Max
UFPs (count/cm3) 10,097 28,473 (9226) 6772 18,184 22,186 26,000 32,320 58,862 109,759
PM2.5 (μg/m3) 3.2 10.9 (2.1) 3.9 7.2 9.9 10.7 13.1 13.8 14.9
NO2 (ppb) 4.1 21.4 (3.5) 9.9 16.4 19.1 21.1 23.2 32.8 48.9
  1. SD standard deviation, IQR interquartile range