Age-specific impacts of body fat mass (BFM) on deciding FEF50 and FEF75 estimated for three different age groups of male and female participants.

(A): Partial regression coefficients of Ln(BFM) for reference means of Ln(FEF50) in young-, middle-, and advanced-age groups of either gender. They are expressed as ΔLn(FEF50)/ΔLn(BFM). (B): Partial regression coefficients of Ln(BFM) for Ln(FEF75) are defined as ΔLn(FEF75)/ΔLn(BFM).