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Table 2 Distribution of hourly pollutant concentrations and weather characteristics during the study period (January 1, 2007 to December 31, 2010)

From: Ambient fine particulate air pollution triggers ST-elevation myocardial infarction, but not non-ST elevation myocardial infarction: a case-crossover study

Pollutant/weather parameter n Mean Standard deviation Minimum 25th 50th 75th Maximum IQR Case–control IQR
PM2.5 1283 8.00 5.70 0.27 3.9 6.7 10.2 43.0 6.3 5.3
 (μg/m3)
Ultrafine particles 1231 5466 2,865 480 3503 5029 6874 37,291 3371 3116
 (#/cm3)
Accumulation mode particles 1231 996 643 108 501 849 1322 4444 821 713
 (#/cm3)
Temperature 1460 10 10 -13 2 11 20 30 18 5
 (°C)
Relative humidity 1461 65 12 30 57 66 74 94 17 11
 (%)           
  1. N = 1461 possible days.