Table 1. Multiple Linear Regression Equations for Respiratory Muscle Strength According to Park et al. (2023)

Variables	Sex	Equation
MIP, cmH₂O	Men	7.88 + (1.28 x HGS + 1.82 x BMI – 0.21 x AGE)
MIP, cmH₂O	Women	7.88 + (1.28 x HGS + 1.82 x BMI – 0.32 x AGE)
MEP, cmH₂O	Men	69.49 + (-4.49 x FTSST +1.75 x HGS)
MEP, cmH₂O	Women	69.49 + (-3.36 x FTSST +1.08 x HGS)
PCF, L/min	Men	391.71 + (-0.84 x AGE + 4.18 x HGS)
PCF, L/min	Women	391.71 + (-1.77 x AGE + 2.24 x HGS)

Example of MIP calculation for a 60-year-old man with HGS 28 and BMI 26; 7.88 + (1.28 × 28 + 1.82 × 26 − 0.21 × 60) = 78.44 cmH₂O. BMI: body mass index, FTSST: five times sit-to-stand test, HGS: hand grip strength, MEP: maximal expiratory pressure, MIP: maximal inspiratory pressure