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Assessing performance of two lung age equations in an Australian population: Using data from the BOLD-Australia study

Background: Lung age is a simple concept for patients to grasp and frequently used as an aid in smoking cessation programmes. Lung age equations need to be reviewed for relevance to target populations. Aim: To assess how new lung age equations developed for Australian populations performed on BOLD-Australia dataset compared to previously used equations. Methods: Cross-sectional study of Australians aged ≥40yrs. Spirometry performed using the ndd EasyOne TM in accordance with ERS/ATS guidelines; analysis restricted to Caucasians Results: 2,793 participants with mean age of 57 (±SD 10) yrs; 52% ever smoked, 10.4% were current smokers and GOLD Stage I or higher COPD was 13.4% (95%CI: 12.2, 14.7). For both genders, recent Newbury equations estimated lung ages significantly older than actual age regardless of smoking status ( p p p Conclusions: Findings support use of updated equations suited to the population of interest. The Newbury equations performed well in BOLD-Australia dataset providing more meaningful lung age profile compared to chronological age, among smokers. Support: National Health and Medical Research Council.