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Table 2 Descriptive statistics. Descriptive statistics (percentiles) of weather and pollution variables during the study period 25 Jan 2002 and 31 May 2005.

From: An outbreak of cardiovascular syndromes requiring urgent medical treatment and its association with environmental factors: an ecological study

   Comparison period (April & May 2002–2004) Outbreak period (April & May 2005) Total period
  Daily N 25th 50th 75th N 25th 50th 75th N 25th 50th 75th
PM10 CBMSa (ug/m3)b Min 183 3.2 5.7 9.3 55 4.3 8.6 13.3 1183 3.0 6.5 10.8
PM10 Earlwoodc (ug/m3) Min 183 4.0 7.2 11.7 61 6.8 9.5 12.5 1191 4.0 7.7 12.2
PM2.5 Earlwood (ug/m3) Mean 183 7.5 10.0 13.3 61 8.6 10.6 13.2 1216 7.6 10.0 13.4
NEPHd Earlwood Mean 176 0.2 0.2 0.4 61 0.2 0.2 0.3 1209 0.1 0.2 0.3
CO CBMS (ppm)e Mean 181 0.1 0.3 0.5 59 0.1 0.2 0.4 1187 0.1 0.1 0.3
NO2 CBMS (ug/m3) Mean 183 24.9 32.1 40.5 57 25.2 33.6 42.2 1183 17.5 26.7 37.8
NO2 Earlwood (pphm)f Mean 182 1.2 1.5 1.8 61 1.1 1.5 1.8 1189 0.8 1.3 1.7
NO CBMS (ug/m3) Mean 183 10.3 24.5 46.9 57 12.9 27.0 57.8 1183 3.4 11.3 29.8
Ozone Earlwood (pphm) Max 177 2.2 2.6 3.0 61 2.5 2.7 3.1 1199 2.3 2.8 3.3
Relative Humidity Airportg (%) Max 183 82.0 90.0 95.0 61 85.5 89.0 91.0 1223 78.5 87.5 93.0
Air Temperature Min 183 12.5 14.3 16.4 61 12.9 15.0 17.2 1194 11.2 15.3 18.6
Airport (°C) Max 183 19.1 21.0 23.0 61 20.0 22.3 24.4 1223 19.0 22.1 25.3
Solar Radiation CBMS (w/m2) Mean 183 108.6 143.6 166.8 61 110.6 148.8 166.6 1223 127.5 174.8 258.6
Precipitation Airport (mm) Max 183 0.0 0.1 5.2 61 0.0 0.0 0.4 1223 0.0 0.0 2.0
Station Pressure Airport (hPa) Mean 183 1015.4 1020.0 1023.6 61 1018.6 1021.9 1024.3 1223 1012.2 1016.9 1021.3
Wind Speed Airport (km/h) Mean 183 13.3 15.9 21.8 61 12.9 16.7 19.7 1223 15.0 18.8 23.7
  1. a A community based monitoring station of the Road and Traffic Authority.
  2. b ug/m3 = micrograms per cubic meter, i.e. mass of pollutant per volume of air.
  3. c A monitoring station of the Environmental Protection Agency at Earlwood.
  4. d Coefficient of light scattering by fine particles per 10 km.
  5. e ppm = parts per million by volume, i.e. parts of million parts of air.
  6. f pphm = parts per hundred million by volume, i.e. parts of pollutant per hundred million parts of air.
  7. g A weather monitoring station at the Sydney Kingsford-Smith Airport.