TABLE 3.

Interobserver Agreement for the Study Group

	Study group (n = 78)
Criteria	Kappa ± SE	95% CI
Cobb angle at the C2-C7 level before operation	0.968 ± 0.022	0.925-1.000
Cobb angle at the C2-C7 level last follow-up	0.873 ± 0.043	0.788-0.958
Changes in the adjacent segment IVD according to Pfirrmann C. before operation	0.921 ± 0.035	0.852-0.989
Changes in the adjacent segment IVD according to Pfirrmann C. at last follow-up	0.857 ± 0.046	0.767-0.947
Changes in the adjacent segment FJ according to Fujiwara A. before operation	0.952 ± 0.027	0.899-1.000
Changes in the adjacent segment FJ according to Fujiwara A. at last follow-up	0.984 ± 0.016	0.953-1.000
Assessment of interspinous process motion on dynamic radiographs at last follow-up	0.825 ± 0.050	0.727-0.924
Assessment of bridging bone according to CT scans	0.794 ± 0.054	0.687-0.900

FJ, facet joint; IVD, intervertebral disk.