Table 1

Characteristics of patients (aged less than 18 years) from 3 September 2010 to 27 September 2015

Total number of patients
n=1 264 585
Patient visits for asthma
n=47 107
Age (year)3.50 (1.25–8.75)3.08 (1.58–6.25)
Sex (boys)996 519 (55.4%)29 816 (63.3%)
Time in emergency department (min)114 (66−195)203 (138−293)
Total visit (year)
 2010 (from 3 September 2010)116 093 (6.5%)3397 (7.2%)
  2011358 995 (20%)8233 (17.5%)
  2012352 460 (19.6%)9694 (20.6%)
  2013349 575 (19.4%)9378 (19.9%)
  2014367 967 (20.5%)10 588 (22.5%)
 2015 (to 27 September 2015)254 237 (14.1%)5817 (12.3%)
French department
  75641 081 (35.6%)12 060 (25.6%)
  7719 610 (1.09%)447 (0.95%)
  7834 873 (1.94%)903 (1.92%)
  9130 352 (1.69%)722 (1.53%)
  92422 105 (23.5%)12 958 (27.5%)
  93378 660 (21.0%)11 501 (24.4%)
  94226 708 (12.6%)7318 (15.5%)
  9545 938 (2.55%)1198 (2.54%)
Distance between home and pollution station (km)
  NO2 1.67 (1.08−2.45)1.72 (1.23−2.45)
  O3 2.81 (1.88−3.95)2.94 (1.90−4.14)
  PM10 2.21 (1.67−3.42)2.30 (1.70−3.48)
  PM2.5 4.39 (3.11−5.46)4.21 (2.91−5.46)
  • Median (IQR) for continuous variables and count (%) for categorical variables.

  • NO2, nitrogen dioxide; O3, ozone; PM2.5, fine particulate matter with an aerodynamic diameter smaller than 2.5 µm; PM10, fine particulate matter with an aerodynamic diameter smaller than 10 µm.