Table 4. Confirmation of optimal conditions for ultrasound extraction of peony root

	TPC (mg GAE/g)	ABTS (%)	Paeoniflorin (mg/g)	Myricetin (mg/g)
Predicted value	99.86	22.09	45.05	201.86
Experimental value	101.79	23.13	46.87	184.32
Error (%)	1.93	4.71	4.04	−8.69

Error (%) = (B – A) / A × 100