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Spirometric reference equations for European females and males aged 65–85 yrs

Servicio de Neumología, Hospital Universitario La Paz, Madrid, Spain

CORRESPONDENCE: F. García-Río, Alfredo Marqueríe 11 izqda 1° A, 28034, Madrid, Spain. Fax: 34 915771309. E-mail: fgr01m@jazzfree.com

Keywords: Elderly, forced expiratory volume in one second, forced spirometry, forced vital capacity, reference values

Received: July 30, 2003
Accepted April 19, 2004

This study was supported by FIS (99/0218) and NEUMOMADRID grants.

The aim of this study was to describe spirometric reference equations for healthy never-smoking European adults aged 65–85 yrs and to compare the predicted values of this sample with those from other studies including middle-aged and/or older adults.

Reference equations and normal ranges for forced expiratory volume in one second (FEV₁), forced vital capacity (FVC), forced expiratory volume in six seconds (FEV₆), FEV₁/FVC ratio and FEV₁/FEV₆ ratio were derived from a healthy subgroup of 458 subjects aged 65–85 yrs. Spirometry examinations followed the 1994 American Thoracic Society recommendations and the quality of the data was continuously monitored and maintained. Reference values and lower limits of normal were derived using a piecewise polynomial model with age and height as predictors.

The reference values of FEV₁ and FVC from the present study were higher than those given by prediction equations from the European Community for Coal and Steel. By contrast, use of prediction equations from Caucasian-American elderly subjects (Cardiovascular Health Study) consistently overpredicted FVC and FEV₁ in females by 8.5 and 2.1%, respectively. In males, equations from the Cardiovascular Health Study overpredicted FVC by 2.8%, whilst underpredicting FEV₁ by 2.5%.

In conclusion, these results underscore the importance of using prediction equations appropriate to the origin, age and height characteristics of the subjects being studied.

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