PFT Adjusted Predicted Values for Women MultiCalc

 

Input
 

Height		cm in m
Age		mo yr
Race	Caucasian (1)
	Black (0.87)
	Asian (0.93)

 

Results
 

FEV1		L mL
FVC		L mL
FEV1 FVC Ratio		% fraction ratio
Decimal Precision   0 1 2 3

 

Notes

• Reviews of predictive formulae show the standard predictive formula produce values slightly below what is observed in healthy women.
• The 1.08 and 1.15 factors help adjust the discrepency. See the articles below for more information.
• The residual standard deviation (RSD) for FEV1 is 0.38 litres. For FVC, the RSD is 0.38 litres and for the ratio, the RSD is 6.51%. These RSD's are based on the data from the original unadjusted formulae.

 
Equations used
 

FEV1 = Race * 1.08 * ((0.0395 * Height) - (0.025 * Age) - 2.6 )

FVC = Race * 1.15 * ((0.0443 * Height) - (0.026 * Age) - 2.89 )

FEV1FVCRatio = 89.1 - (0.19 * Age)

 

Calculation Details and Variables

• Equation parameters such as Race, have two or more discrete values that may be used in the calculation. The numbers in the parentheses, e.g. (1), represent the values that will be used.

 

References

1. Quanjer PhH, Tammeling GJ, Cotes JE, et al. Lung volume and forced ventilatory flows. Report Working Party Standardization of lung function tests. Official Statement European Respiratory Society. Eur Respir J. 1993; 6 Suppl 16: 5-40. PubMed ID: 8499054
2. Falaschetti E, Laiho J, Primatesta P, Purdon S. Prediction equations for normal and low lung function from the Health Survey for England. Eur Respir J. 2004 Mar;23(3):456-63. PubMed ID: 15065839