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. Author manuscript; available in PMC: 2011 Jun 1.
Published in final edited form as: Respir Med. 2010 Jan 4;104(6):858–864. doi: 10.1016/j.rmed.2009.12.006

Table 3.

Equations to Adjust FVC Values from Tests with Short Exhalation Times

Group Estimated FVC (liters) as a function of exhalation time
White males −3.03480 + 0.04490*exhalation time − 0.00003*age + 0.02634*height (cm) + 0.78110*FEV1
White females −2.38537 + 0.03321*exhalation time + 0.00758*age + 0.02019*height (cm) + 0.78477*FEV1
Black males −2.24801 + 0.04734*exhalation time + 0.00373*age + 0.01788*height (cm) + 0.85956*FEV1
Black females −1.72559 + 0.03177*exhalation time + 0.00116*age + 0.01523*height (cm) + 0.83039*FEV1

The equations to calculate predicted FVC were developed using generalized estimating equations (GEE) that included measured FVC, FEV1, exhalation time, age and height. To calculate the adjusted FVC value for otherwise acceptable FVC tests with an exhalation time of at least 2 seconds but less than 6 seconds, an exhalation time of 6 seconds or more is inserted in the above equations.