Table 1 Comparison of patients'age, clicking duration, locking duration, paining duration and interincisal opening between the adhesion group and the non-adhesion group 
Item | Adhesion group (n = 490) | Non-adhesion group (n = 1230) | t | P* |
|---|---|---|---|---|
Age (years) | 35.03 ± 14.10 | 27.33 ± 11.78 | 10.41 | .000* |
Clicking duration (month) | 18.91 ± 32.18 | 20.59 ± 27.85 | 1.08 | 0.281 |
Locking duration (month) | 6.97 ± 8.38 | 5.42 ± 4.34 | 3.89 | .000* |
Paining duration (month) | 4.61 ± 4.80 | 3.71 ± 4.03 | 3.66 | .000* |
IO pre-operation (mm) | 24.33 ± 6.82 | 28.38 ± 8.18 | 9.54 | .000* |