Table 1

Summary statistics of daily emergency hospital admissions for pneumonia, air pollution concentrations and weather conditions in Hong Kong 2011–2012

VariablesNo of daysMeanSDCentiles
Min25th50th75thMax
Daily emergency hospital admissions
 Total pneumonia731103.823.8528699118.5184
  Female patients73148.312.72039465687
  Male patients73155.513.425465363105
  Age <1573111.75.1281114.532
  Age 15–6473114.75.3311141740
  Age 65–7473111.13.918111424
  Age ≥7573166.316.134546477119
Pollution concentration (μg/m3)
 PM1073145.4423.247.5625.8242.9561.40157.35
 PM2.573130.8816.794.9216.7028.3842.8085.81
 PMc73114.648.781.868.3812.7718.68108.91
 NO273156.0517.7412.9943.5354.2166.44136.22
 O373149.4232.406.1224.7341.7168.52189.76
 SO273112.426.013.278.0011.1515.2745.32
Meteorology measures
 Temperature (°C)73123.25.58.718.724.828.231.8
 Relative humidity (%)73178.49.839.074.079.085.099.0
  • Max., maximum; Min., minimum; PM2.5, particles with an aerodynamic diameter less than 2.5 μm; PM10, particles with an aerodynamic diameter less than 10 μm; PMc, coarse particulate matter.