Aas graded the severity of asthma based on its clinical features.
(1) number of short duration episodes with symptoms and functional restriction, separated from each other by long symptom-free intervals of apparently normal lung function
(2) presence of prolonged symptomatic periods with obstruction and restricted function
(3) total duration of prolonged symptomatic periods
(4) need for continuous use of asthma medications and/or hospital care
Total Time Per Year Prolonged
Need for Continuous Medications
1 to 4
< 12 weeks
5 to 10
12 to 23
24 or more
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