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Table 1 Descriptive statistics of daily mortality counts, air pollutant concentrations, and meteorological parameters

From: Ambient air pollution and respiratory mortality in Xi’an, China: a time-series analysis

  Mean ± SD Min P25 P50 P75 Max
Respiratory diseases 9 ± 3.95 1 6 9 11 23
 Male 5.63 ± 2.84 1 3 5 7 17
 Female 3.59 ± 1.98 1 2 3 5 11
  ≤ 64 years 1.90 ± 1.07 1 1 2 2 8
  ≥ 65 years 3.22 ± 1.81 1 2 3 4 10
Air pollutant concentration (μg/m3)a
 PM2.5 66.63 ± 50.13 11 36 53 77.25 527
 SO2 26.38 ± 21.55 2 12 19 35 145
 O3 39.62 ± 24.45 5 20 33 56 117
Meteorological parameters
 Temperature (°C) 13.48 ± 9.60 −8 5 14 22 34
 Humidity (%) 65.43 ± 15.8 21 55 65 78 99
  1. a 24-hour averages for PM 2.5 , and SO 2 ; the maximal 8-h average for O 3
  2. SD: standard deviation; Px (xth percentiles)