Test No.

Factors

Results of pH value

A

B

C

D

E

F

G

Before sterilization

After the accelerated tests

ΔpH value

1

1

1

1

1

1

1

1

4.85

3.82

−1.03

2

1

2

2

2

2

2

2

5.60

6.24

0.64

3

1

3

3

3

3

3

3

6.31

6.78

0.47

4

2

1

1

2

2

3

3

7.28

7.48

0.2

5

2

2

2

3

3

1

1

5.35

5.83

0.48

6

2

3

3

1

1

2

2

5.91

6.37

0.46

7

3

1

2

1

3

2

3

5.95

4.26

−1.69

8

3

2

3

2

1

3

1

6.39

6.63

0.24

9

3

3

1

3

2

1

2

4.73

4.96

0.23

10

1

1

3

3

2

2

1

5.47

4.63

−0.84

11

1

2

1

1

3

3

2

6.38

6.76

0.38

12

1

3

2

2

1

1

3

5.17

6.02

0.85

13

2

1

2

3

1

3

2

6.86

5.49

−1.37

14

2

2

3

1

2

1

3

4.83

5.37

0.54

15

2

3

1

2

3

2

1

5.79

6.13

0.34

16

3

1

3

2

3

1

2

4.97

4.03

−0.94

17

3

2

1

3

1

2

3

5.96

6.21

0.25

18

3

3

2

1

2

3

1

7.14

7.78

0.64

${\overline{K}}_1$

0.078

−0.945

0.062

−0.117

−0.100

0.022

−0.028

${\overline{K}}_2$

0.108

0.422

−0.075

0.222

0.235

−0.140

−0.100

${\overline{K}}_3$

−0.212

0.498

−0.012

−0.130

−0.160

0.093

0.103

R

0.320

1.443

0.137

0.352

0.395

0.233

0.203