Group number

Mean ± SD

P

N

CP-0

2.13^A

<0.001

0

CP-1

2.15^A

2

FP-0

2.94^A

0

FP-1

2.94^B

8

PP-0

1.66^A

2

PP-1

1.65^B

9

Total

Repairable

21