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Table 1 Daily mean, median, standard deviation (SD) and interquartile ranges (IQR) for air pollution and weather variables during the period 2007 to 2012

From: Do acute changes in ambient air pollution increase the risk of potentially fatal cardiac arrhythmias in patients with implantable cardioverter defibrillators?

 OverallWarmCold
Days of observation * 105 *Mean (SD)Median (IQR)Mean (SD)Median (IQR)Mean (SD)Median (IQR)
Weather
 Temperature, °C9.817.85 (10.53)8.49 (−0.28,17.07)15.74 (6.12)16.87 (11.84,20.46)−0.07 (7.70)−0.10 (−5.52,5.23)
 Relative humidity, %9.6573.19 (12.27)73.95 (65.50,82.08)70.65 (12.70)71.45 (62.33,79.89)75.75 (11.26)76.21 (68.56,83.96)
 Barometric pressure, kPa9.6299.32 (1.19)99.45 (98.54,100.17)99.23 (1.12)99.39 (98.51,100.04)99.41 (1.26)99.53 (98.58,100.33)
Air Pollutant
 SO2, ppb7.141.90 (3.06)1.00 (0.43,2.14)1.72 (3.07)1.00 (0.24,2.00)2.09 (3.04)1.15 (0.61,2.82)
 NO2, ppb8.7411.44 (6.78)10.04 (6.02,15.31)9.43 (5.60)8.16 (5.01,12.57)13.46 (7.24)12.37 (8.00,18.00)
 Ozone, ppb9.2326.52 (9.71)26.00 (19.44,33.00)30.37 (9.55)30.00 (23.37,36.61)22.64 (8.20)22.33 (16.63,28.59)
 PM2.5, μg/m39.198.21 (5.60)6.57 (4.26,10.55)8.47 (5.76)6.91 (4.29,10.84)7.95 (5.42)6.32 (4.19,10.52)
 AQHI8.582.70 (0.75)2.63 (2.19,3.13)2.72 (0.80)2.66 (2.15,3.21)2.68 (0.70)2.61 (2.21,3.06)
  1. *Number of days of observation for each forward 3-digit postal code area multiplied by the number of these areas in the study