Context: Other supportive evidence includes: a ≥20% difference in peak expiratory flow rate on at least three days in a week for at least two weeks, a ≥20% improvement of peak flow following treatment with either salbutamol, inhaled corticosteroids or prednisone, or a ≥20% decrease in peak flow following exposure to a trigger. Testing peak expiratory flow is more variable than spirometry, however, and thus not recommended for routine diagnosis. It may be useful for daily self-monitoring in those with moderate to severe disease and for checking the effectiveness of new medications. It may also be helpful in guiding treatment in those with acute exacerbations.

Question: What is the rate that is used in most of the evidence?
Answer: ≥20%

Question: What is more variable than spirometry but not recommended?
Answer: . Testing peak expiratory flow

Question: What is not as stable as prednisone for a routine diagnosis?
Answer: Unanswerable

Question: What is one instance when testing with prednisone is useful?
Answer: Unanswerable

Question: When may prednisone also be helpful in spirometry?
Answer: Unanswerable

Question: What percentage of a group think prednisone is helpful for treatment in acute cases?
Answer: Unanswerable

Question: What percentage of people in acute cases use salbutamol?
Answer: Unanswerable