Table 2 Analysis of variance (ANOVA) results of remove ENF and RhB.

Source	DF	ENF				RhB
Source	DF	Sum of squares	Mean square	F-value	P-value	Sum of squares	Mean square	F-value	P-value
Model	20	7893.73	394.69	424.08	<0.0001	5271.07	263.55	1721.34	<0.0001
X₁	1	984.06	984.06	1057.34	<0.0001	1303.16	1303.16	8511.29	<0.0001
X₂	1	1931.78	1931.78	2075.63	<0.0001	1151.35	1151.35	7519.76	<0.0001
X₃	1	1455.17	1455.17	1563.53	<0.0001	857.17	857.17	5598.42	<0.0001
X₄	1	827.20	827.20	888.80	<0.0001	437.33	437.33	2856.34	<0.0001
X₅	1	1320.17	1320.17	1418.47	<0.0001	633.76	633.76	4139.26	<0.0001
X₁ X₂	1	10.56	10.56	11.35	0.0063	0.052	0.052	0.34	0.5727
X₁ X₃	1	63.60	63.60	68.34	<0.0001	5.75	5.75	37.54	<0.0001
X₁ X₄	1	4.08	4.08	4.38	0.0602	0.63	0.63	4.10	0.0678
X₁ X₅	1	38.38	38.38	41.24	<0.0001	0.018	0.018	0.11	0.7413
X₂ X₃	1	11.63	11.63	12.49	0.0047	1.87	1.87	12.21	0.0050
X₂ X₄	1	49.07	49.07	52.72	<0.0001	0.52	0.52	3.41	0.0919
X₂ X₅	1	3.92	3.92	4.21	0.0647	12.34	12.34	80.58	<0.0001
X₃ X₄	1	92.54	92.54	99.44	<0.0001	6.59	6.59	43.05	<0.0001
X₃ X₅	1	94.58	94.58	101.62	<0.0001	4.03	4.03	26.32	0.0003
X₄ X₅	1	70.73	70.73	75.99	<0.0001	7.58	7.58	49.48	<0.0001
\({X}_{1}^{2}\)	1	98.42	98.42	105.75	<0.0001	400.14	400.14	2613.44	<0.0001
\({X}_{2}^{2}\)	1	37.32	37.32	40.10	<0.0001	102.26	102.26	667.91	<0.0001
\({X}_{3}^{2}\)	1	50.47	50.47	54.23	<0.0001	71.01	71.01	463.80	<0.0001
\({X}_{4}^{2}\)	1	823.73	823.73	885.07	<0.0001	422.11	422.11	2756.88	<0.0001
\({X}_{5}^{2}\)	1	78.58	78.58	84.43	<0.0001	63.90	63.90	417.33	<0.0001
Residual	11	10.24	0.93			1.68	0.15
Lack of Fit	6	7.04	1.17	1.84	0.2605	0.37	0.062	0.24	0.9464
Pure Error	5	3.19	0.64			1.31	0.26
Cor Total	31	7903.97				5272.76

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