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VO2 max (Impairment based on ability to do jobcomfortably at 40 percent VO2 max). ≥25mL/kg/min (Capable of all but most strenuous jobs). 15 to 25mL/kg/min and average metabolic work of job is less than 40 percent ofVO2 max. (Should be able to perform that job comfortably). ≤15mL/kg/min (Unable to do most jobs due to discomfort even traveling toand from work). FVC: forced vital capacity; FEV1: forced expiratory volume in the first second; DLCOsb: single-breath carbon monoxide diffusing capacity of the lungs; V02 max: maximum aerobic power. * Predicted values based on height, age, and sex of white Americans. These prediction values should be used when applying the American Thoracic Society criteria for respiratory impairment. Adapted from American Thoracic Society. Am Rev Respir Dis 1986; 133:1205.