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Table 2 Asthma medication prescription and usage as a function of FEV1%, based on NHLBI guidelines given asthma severity classification[8]

From: The effects of indoor environmental exposures on pediatric asthma: a discrete event simulation model

FEV1%   Prescription   Usage
>80% Albuterol Take on days with asthma symptoms
  One controller medicine Daily
60-80% Albuterol Take on days with asthma symptoms
  Two controller medicines Daily
<60% Albuterol Take on days with asthma symptoms
  Three controller medicines Daily