Table 6

 Comparison of the distribution of asthma severity (%) based on different indexes applied to different populations

Cohort of asthmatic patients, Quebec, Canada*(n = 139 283 person-years)Cohort of asthmatic patients, France20†(n = 4333)AIR America survey, USA21‡(n = 2509)Cohort of asthmatic patients, Ontario, Canada7§(n = 1279)
*Index based on dispensed medications and medical services for asthma.
†Index based on symptoms and forced expiratory volume in 1 s (FEV1).
‡Index based on symptoms and the current state of asthma management.
§Index based on reported daily medication use.
Mild asthma63665928
Moderate asthma23212249
Severe asthma14131923