Table 1

Variables considered for the statistical analyses

Name of the variableUnitMinimumMedianMaximum
 COPD (ICD-10 J44)Cases per day*0720
 Asthma bronchiale (ICD-10 J45)Cases per day*0413
 Day of the weekMonday to Sunday
 SeasonWinter, spring, summer, autumn†
 Year2013, 2014, 2015
 Running dayDay
 Running day²Day
 Running day³Day
 Tmean (°C‡)−10.39.927.2
 Tmax (°C)‡−8.713.936.4
 Tmin (°C)‡−12.55.819.2
 Daily mean relative humidity§(%)‡42.582.0100.0
 Daily mean vapour pressure§(hPa)‡2.29.723.1
 Daily mean wind speed§(m/s)‡0.63.910.3
 NO concentrations§(µg/m3)‡2.04.3110.6
 PM10 concentrations§(µg/m3)‡4.517.884.6
 O3 concentrations§(µg/m3)‡1.446.6132.2
  • Environmental data were retrieved for the airport station Hamburg-Fuhlsbüttel. Minimum, maximum and median values are shown for the analysis period (2013–2015).

  • *Time interval from 1 January 2013 to 31 December 2015.

  • †Winter: December, January, February; spring: March, April, May; summer: June, July, August; autumn: September, October, November.

  • ‡Time interval from 1 December 2012 to 31 December 2015.

  • §Variables selected for the final categorical principal component analysis.

  • COPD, Chronical Obstructive Pulmonary Syndrome; NO, nitric oxide; O3, ozone; PET, physiological equivalent temperature; PM10, particulate matter with an aerodynamic diameter of ≤10 µm; T, daily temperature.