Group

1 month after the operation

3 months after the operation

6 months after the operation

A (n = 19)

43.08 ± 1.84

27.46 ± 1.24

12.18 ± 0.97

B (n = 20)

27.46 ± 1.52*

6.98 ± 0.64*

0*

P value

0.012

0.006

0.000