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Table 1 Summary statistics of daily air pollutants, weather condition and emergency hospital visits for hypertension in Beijing, 2007

From: Gaseous air pollution and emergency hospital visits for hypertension in Beijing, China: a time-stratified case-crossover study

  Minimum 25% 50% 75% Maximum Mean SD
SO2 (μg/m3) 6.0 15.0 26.0 64.0 247.5 47.3 48.6
NO2 (μg/m3) 17.6 51.2 64.0 78.4 150.4 66.6 22.8
PM10 (μg/m3) 15.0 96.0 140.0 184.0 600.0 149.3 85.7
Temperature (°C) -6.1 3.7 14.5 25.0 30.7 14.1 10.7
Humidity (%) 15.0 37.0 54.0 74.0 97.0 54.2 20.9
EHVs 0 2 4 5 19 4.1 0.1