TABLE 4.

Intraobserver Agreement for the AO Spine members’ Based on the Overall Classification, Injury Location, and Injury Type

AO Spine Upper Cervical Injury Classification System*	Intraobserver Reproducibility (κ)
	Overall Classification	Injury Location	Injury Type
Mean Kappa values (SD)	0.70 (0.19)	0.88 (0.19)	0.67 (0.22)
Level of agreement	Absolute number and percent of intraobserver agreement, N (%)
Slight (<0.2)	5 (2.4)	4 (1.9)	8 (3.9)
Fair (0.20–0.40)	10 (4.9)	2 (1.0)	10 (4.9)
Moderate (0.41–0.60)	32 (15.5)	10 (4.9)	47 (22.8)
Substantial (0.61–0.80)	79 (38.4)	17 (8.3)	73 (35.4)
Excellent (0.81–1.0)	80 (38.8)	173 (84.0)	68 (33)

Level of agreement is based on the Landis and Koch interpretation.

^*Based on 206 validation members who participated in both assessments.