Levels

A

B

C

D

Extraction efficiency (%)

1

1

1

1

1

5.16

2

1

2

2

2

5.01

3

1

3

3

3

5.21

4

2

1

2

3

5.15

5

2

2

3

1

4.76

6

2

3

1

2

5.20

7

3

1

3

2

4.40

8

3

2

1

3

4.47

9

3

3

2

1

4.67

I

15.38

14.63

14.83

14.59

-

II

15.11

14.71

14.83

14.61

-

III

13.54

15.08

14.37

14.83

-

R

1.84

0.45

0.46

0.24

-