Table 3. Predicted levels of treatment conditions for optimum responses of variables by the ridge analysis

Responses variables	Independent variables¹⁾			Estimated response	Morphology
Responses variables	X₁	X₂	X₃	Estimated response	Morphology
Residual patulin content (ppb)	0.48	0.00	9.40	675.00 (Max.)	Saddle point
Residual patulin content (ppb)	18.19	1.24	13.42	58.42 (Min.)	Saddle point
Polyphenolics content (mg/g)	14.40	0.78	3.40	11.98 (Max.)	Saddle point
Polyphenolics content (mg/g)	−5.46	0.22	15.13	9.79 (Min.)	Saddle point

X₁, storage temperature (°C); X₂, irradiation dose (kGy); X₃, storage period (day).