Age-specific impacts of body fat mass (BFM) on FEV1 and FEV1/FVC estimated for three different age groups of both men and women.

(A): Partial regression coefficients of Ln(BFM) for reference means of Ln(FEV1) in young-, middle-, and advanced-age groups of either gender, which were expressed as ΔLn(FEV1)/ΔLn(BFM). (B): Partial regression coefficients of Ln(BFM) for Ln(FEV1/FVC), being defined as ΔLn(FEV1/FVC)/ΔLn(BFM).