| Study groups | p value | |
---|---|---|---|
Control (n = 87) | ES (n = 89) | ||
1Â months after the operation | |||
 Excellent | 6 (6.9%) | 15 (16.9%) |  < 0.001 |
 Good | 25 (28.7%) | 46 (51.7%) | |
 Fair | 36 (41.4%) | 16 (17.9%) | |
 Poor | 20 (23.0%) | 12 (13.5%) | |
6Â months after the operation | |||
 Excellent | 21 (24.1%) | 32 (35.9%) | 0.029 |
 Good | 33 (37.9%) | 41 (46.1%) | |
 Fair | 26 (29.9%) | 13 (14.6%) | |
 Poor | 7 (8.1%) | 3 (3.4%) |