Table 5. Analysis of variance for ACE inhibitory activity, pH (coded units) about fermented milk by Lactiplantibacillus plantarum K79

Response	Sources	DF	SS	MS	F-value	p-value
Y1	Regression	14	2,152.78	153.770	3.24	0.024
	Linear	4	1,443.41	360.853	7.61	0.003
	Square	4	653.14	163.286	3.44	0.043
	Interaction	6	56.23	9.371	0.20	0.971
	Residual error	12	568.97	47.414	-	-
	Lack of fit	10	563.85	56.385	22.00	0.044
	Pure error	2	5.13	2.563	-	-
	Total	26	2,721.76	-	-	-
Y2	Regression	14	5.70276	0.40734	8.21	0.000
	Linear	4	4.93970	1.23493	24.89	0.000
	Square	4	0.45121	0.11280	2.27	0.122
	Interaction	6	0.31185	0.05198	1.05	0.443
	Residual error	12	0.59540	0.04962	-	-
	Lack of fit	10	0.59533	0.05953	1,786.00	0.001
	Pure error	2	0.00007	0.00003	-	-
	Total	26	6.29816	-	-	-

Y₁, ACE inhibitory activity (%), Y₂, pH; DF, degrees of freedom; SS, sum of squares; MS, mean square (MS=SS/DF); ACE, angiotensin converting enzyme.