Validation study
Subjects
Fifty adults (17±70 yrs) were enrolled from previous
studies, local media notices and asthma clinics. They were
required to have symptomatic asthma with an ACQ score
>0.5 at enrolment. Patients were excluded if they had
evidence of chronic obstructive pulmonary disease, an illness
with symptoms similar to those of asthma (e.g.
cardiac), recurrent chest infections, or were unable to communicate
in English. The study was approved by the
McMaster University Faculty of Health Sciences Ethics
Committee. All patients signed an informed consent form.