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Lung age estimates the age of your lungs from FEV1 spirometry, comparing actual function to predicted function for different ages. Used in smoking cessation — telling a smoker their lungs are 10 years older is more motivating than quoting FEV1%.

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1. 1Predicted FEV1 by sex, age, height (Quanjer equations)
2. 2Lung age: find the age at which predicted FEV1 equals actual FEV1

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