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Table 2 24-h-averages of air pollutants and meteorological variables between October 2000 and April 2001

From: Ultrafine particles and platelet activation in patients with coronary heart disease – results from a prospective panel study

Variable N Mean (± SD#) Min. 25% Median 75% Max. IQR†† IQR†† 5-day average
UFP* [n/cm 3 ] 196 12602 (± 6455) 2542 7326 11444 17332 34294 10005 6821
AP* [n/cm 3 ] 167 1593 (± 1034) 328 821 1238 2120 4908 1299 1127
PM 2.5 *[μg/m 3 ] 197 20.0 (± 15.0) 2.6 9.7 14.9 26.1 83.7 16.4 12.2
PM 10 *[μg/m 3 ] 154 20.0 (± 13.0) 5.4 10.8 15.6 26.0 74.5 15.2 12.8
NO [μg/m 3 ] 196 24.4 (± 27.7) 4.0 6.8 12.3 30.3 137.6 23.5 21.0
Air temperature [°C] 198 4.1 (± 4.8) -10.4 0.5 4.4 7.9 13.2 7.4 5.9
Barometric pressure [hPa] 198 973.4 (± 9.7) 949.5 966.3 972.9 980.0 995.7 13.6 10.8
Relative humidity § [%] 198 83.5 (± 8.8) 55.8 78.9 84.3 88.8 100.0 10.0 9.1
  1. * UFP, ultrafine particles, number concentration of particles with a size range of 0.01 to 0.1 μm in diameter
  2. 13% of the hourly measurements were imputed,
  3. AP, Accumulation mode particles, particles with a size range of 0.1 to 1.0 μm,
  4. PM2.5, mass concentration of particles less than 2.5 μm in diameter
  5. 15% of the hourly measurements were imputed
  6. PM10, mass concentration of particles less than 10 μm in diameter
  7. † NO, Nitrogen monoxide;
  8. ‡ Temperature: 0.5% of the hourly measurements were imputed
  9. §Relative humidity: 0.5% of the hourly measurements were imputed
  10. # SD, standard deviation
  11. †† IQR, inter quartile range