Table 3 Comparative study between endoanal ultrasound and MRI in detection of the internal opening
|  | Internal opening (MRI) | Cohen’s kappa coefficient | P value | |||
|---|---|---|---|---|---|---|
Yes | No | |||||
Count | % | Count | % | |||
Internal opening (endoanal ultrasound) | ||||||
 Yes | 96 | 100.0 | 16 | 66.7 | 0.444 | < 0.001 |
 No | 0 | 0.0 | 8 | 33.3 |  |  |