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

3.67

−1.18

2

1

2

2

2

2

2

2

5.60

6.44

0.84

3

1

3

3

3

3

3

3

6.31

7.21

0.90

4

2

1

1

2

2

3

3

7.28

7.38

0.10

5

2

2

2

3

3

1

1

5.35

5.79

0.44

6

2

3

3

1

1

2

2

5.91

6.59

0.68

7

3

1

2

1

3

2

3

5.95

4.20

−1.75

8

3

2

3

2

1

3

1

6.39

6.79

0.40

9

3

3

1

3

2

1

2

4.73

4.93

0.20

10

1

1

3

3

2

2

1

5.47

4.20

−1.27

11

1

2

1

1

3

3

2

6.38

7.04

0.66

12

1

3

2

2

1

1

3

5.17

6.28

1.11

13

2

1

2

3

1

3

2

6.86

5.57

−1.29

14

2

2

3

1

2

1

3

4.83

5.34

0.51

15

2

3

1

2

3

2

1

5.79

6.60

0.81

16

3

1

3

2

3

1

2

4.97

3.85

−1.12

17

3

2

1

3

1

2

3

5.96

6.30

0.34

18

3

3

2

1

2

3

1

7.14

7.97

0.83

${\overline{K}}_1$

0.177

−1.085

0.155

−0.042

0.010

−0.007

0.005

${\overline{K}}_2$

0.208

0.532

0.030

0.357

0.202

−0.058

−0.005

${\overline{K}}_3$

−0.183

0.755

0.017

−0.113

−0.010

0.267

0.202

R

0.391

1.840

0.138

0.470

0.212

0.325

0.207