Table 2 Interobserver agreement (Cohen’s kappa coefficient) of tested classification systems
From: Comparison of preoperative MRI and intraoperative findings of posterior tibial tendon insufficiency
Classification | M1 | M2 (Rosenberg et al. 1988) | M3 (Conti et al. 1992) | M4 (Kong and Van Der Vliet 2008) |
|---|---|---|---|---|
Intraoperative findings | ||||
OP1–OP2 | 0.59 | 0.72 | 0.60 | 0.59 |
Preoperative MRI findings | ||||
MR1–MR2 | 0.48 | 0.39 | 0.32 | 0.52 |
Intraoperative–preoperative findings | ||||
OP1–MR1 | −0.05 | 0.30 | 0.07 | 0.30 |
OP1–MR2 | 0.10 | 0.32 | 0.24 | 0.32 |
OP2–MR1 | 0.05 | 0.43 | 0.17 | 0.30 |
OP2–MR2 | 0.21 | 0.28 | 0.18 | 0.38 |
OP–MR (mean kappa coefficient, 95 % CI) | 0.08 (0.05–0.10) | 0.33 (0.32–0.35) | 0.17 (0.15–0.18) | 0.33 (0.32–0.33) |