Age-specific contributions of body weight (BW) to FVC and FEV₁ estimated for three different age groups of both genders.

<p>(A): Partial regression coefficients of Ln(BW) for reference means of Ln(FVC) in young-, middle-, and advanced-age groups of either gender. They are designated as ΔLn(FVC)/ΔLn(BW). (B): Partial regression coefficients of Ln(BW) for Ln(FEV₁) are designated as ΔLn(FEV₁)/ΔLn(BW).