TABLE 1. Criteria for Asthma Severity by Age (2007 NAEPP EPR 3 Guidelines)

FEV₁ = forced expiratory volume in 1 second; FVC = forced vital capacity; PFT = pulmonary function test.
Reprinted with permission from Reddy AP, Gupta MR. Management of asthma: the current US and European guidelines. Adv Exp Med Biol. 2014;795:81-103; adapted from National Asthma Education and Prevention Program. Expert Panel Report 3 (EPR3): guidelines for the diagnosis and management of asthma. Summary report 2007. National Heart Lung and Blood Institute, Bethesda, MD. NIH publication no. 08-5846.