Male: PEF = exp(0.544 * ln(Age) - 0.0151 * Age - 74.7 / Height + 5.48)
Female: PEF = exp(0.376 * ln(Age) - 0.0120 * Age - 58.8 / Height + 5.63)
Predicted Value Percentage = PEF Measured Value / PEF Predicted Value %
This formula is for adults only.