| CTC positive group | CTC negative group | statistics | P value |
Gender: Male/Female) | 17/13 | 16/13 | z = 0.3207 | 0.8061 |
Age (x ± s) | 57.06 ± 1.899 | 56.07 ± 1.894 | t = 0.6954 | 0.5107 |
Location (left/right) | 18/12 | 16/13 | z = 1.848 | 0.0798 |