Table 2 Levels of agreement between the specialists, residents and professors and in the paired groups, related to the variables

Anatomic verification

0.768 (0.726, 0.810), p < 0.001**

0.887 (0.837, 0.938), p < 0.001**

0.462 (0.361, 0.563), p < 0.001**

0.898 (0.853, 0.944), p < 0.001**

Standard plane

0.924 (0.899, 0.949), p < 0.001**

0.915 (0.874, 0.955), p < 0.001**

0.887 (0.840, 0.934), p < 0.001**

0.965 (0.938, 0.993), p < 0.001**

The USG can be evaluated

0.890 (0.861, 0.919), p < 0.001**

0.883 (0.835, 0.931), p < 0.001**

0.777 (0.701, 0.853), p < 0.001**

0.970 (0.945, 0.996), p < 0.001**

Bone roof

0.388 (0.342, 0.434), p < 0.001**

0.219 (0.134, 0.305), p < 0.001**

0.264 (0.174, 0.355), p < 0.001**

0.531 (0.437, 0.625), p < 0.001**

Cartilage roof

0.905 (0.879, 0.931), p < 0.001**

0.796 (0.733, 0.859), p < 0.001**

0.955 (0.922, 0.988), p < 0.001**

0.964 (0.928, 0.999), p < 0.001**

Morphological evaluation

0.813 (0.773, 0.853), p < 0.001**

0.795 (0.734, 0.856), p < 0.001**

0.712 (0.640, 0.784), p < 0.001**

0.818 (0.752, 0.884), p < 0.001**

Type

0.893 (0.858, 0.928), p < 0.001**

0.910 (0.865, 0.955), p < 0.001**

0.892 (0.833, 0.950), p < 0.001**

0.866 (0.809, 0.923), p < 0.001**

Alpha angle

0.622 (0.566, 0.678), p < 0.001**

0.470 (0.356, 0.570), p < 0.001**

0.651 (0.564, 0.724), p < 0.001**

0.675 (0.592, 0.744), p < 0.001**

Beta angle

0.054 (0.015, 0.103), p = 0.003**

− 0.204 (− 0.332, − 0.070), p = 0.998

−0.203 (−0.331, −0.067), p = 0.998

0.508 (0.398, 0.604), p < 0.001**