highly significantp < 0.0001
All models were highly significant ( p < 0.0001), with high F-values (R1 = 583.16, R2 = 695.27, R3 = 289.65, R4 = 46.85, R5 = 215.85, and R6 = 187.61 for theoretical plates) and non-significant lack-of-fit tests, indicating strong predictive capability.