Process index		Constant	ECR	Conductivity	pH	Fructose content	Raffinose content	Stachyose content	Purity of Danshensu	Purity of protocatechuic aldehyde	Purity of Caffeic acid	Purity of Rosmarinic acid	Purity of Lithospermic acid	Purity of Salvianolic acid B	R2	R2adj
Purity of Danshensu	Regression coefficient	1.051	0.140			0.467					0.618				0.7436	0.7222
Purity of Danshensu	P value		<0.0001			<0.0001					0.0004
Purity of protocatechuic aldehyde	Regression coefficient	0.051	0.035				−0.113			0.144			0.099	−0.047	0.8185	0.7918
Purity of protocatechuic aldehyde	P value		<0.0001				<0.0001			<0.0001			<0.0001	0.0020
Purity of Caffeic acid	Regression coefficient	0.093	0.018					−0.017			0.103		0.050	−0.043	0.8163	0.7893
Purity of Caffeic acid	P value		<0.0001					0.0024			<0.0001		<0.0001	<0.0001
Purity of Rosmarinic acid	Regression coefficient	1.251	0.188								0.562	0.932			0.8973	0.8888
Purity of Rosmarinic acid	P value		<0.0001								0.0033	<0.0001
Purity of Lithospermic acid	Regression coefficient	0.329	0.078			0.236	−0.271						0.404		0.8121	0.7907
Purity of Lithospermic acid	P value		0.0002			<0.0001	0.0011						<0.0001
Purity of Salvianolic acid B	Regression coefficient	7.245	1.811	6.463			−6.010						9.837	4.460	0.8614	0.8410
Purity of Salvianolic acid B	P value		<0.0001	0.0040			<0.0001						<0.0001	<0.0001
Retention of Danshensu	Regression coefficient	25.43			11.23			−14.66		−18.35			14.08		0.6643	0.6259
Retention of Danshensu	P value				0.0483			<0.0001		0.0015			0.0011
Retention of Protocatechuic aldehyde	Regression coefficient	25.663			18.333		−63.747						54.449	−29.880	0.7865	0.7621
Retention of Protocatechuic aldehyde	P value				0.0015		<0.0001						<0.0001	<0.0001
Retention of Caffeic acid	Regression coefficient	43.616					−23.776	−15.319					31.777	−18.420	0.7006	0.6664
Retention of Caffeic acid	P value						0.0053	0.0010					<0.0001	0.0004
Retention of Rosmarinic acid	Regression coefficient	14.384				−37.991		−27.229			−23.281	−5.649	27.796		0.8509	0.8290
Retention of Rosmarinic acid	P value					<0.0001		<0.0001			0.0154	0.0272	<0.0001
Retention of Lithospermic acid	Regression coefficient	10.850	−5.035	−25.966				−23.430	23.250	−10.815	−13.268				0.8328	0.8024
Retention of Lithospermic acid	P value		<0.0001	0.0060				<0.0001	0.0066	0.0078	0.0399
Retention of Salvianolic acid B	Regression coefficient	29.590	−3.669					−17.910		−13.144		19.925			0.7769	0.7514
Retention of Salvianolic acid B	P value		0.0036					<0.0001		0.0007		<0.0001