Optimization of Ultrasound-Assisted Extraction of Flavonoids from Celastrus hindsii Leaves Using Response Surface Methodology and Evaluation of Their Antioxidant and Antitumor Activities

Table 3

Analysis of variance for the RSM model.

Source	DF^b	SS^b	MS^b	F value	Probability (p) > F
Model^a	14	51.39	3.67	25.87	<0.0001
Residual (error)	12	1.70	0.14
Total	26	53.09

^aCoefficient of determination (R²) = 0.97; adjusted R² = 0.93. ^bDF, degree of freedom; SS, sum of squares; MS, mean square.