Figure 1.

Serial asthma testing algorithm (Confirmed Asthma = 346, Asthma excluded = 150) (PC20 - the provocation concentration that caused decrease in forced expiratory volume in 1 second (FEV1) of 20%).

Pakhale et al. BMC Pulmonary Medicine 2011 11:27   doi:10.1186/1471-2466-11-27
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