Table 2.

Studies of intra- and interobserver reliability of the Eaton classification

Study	Year	Observers	Number of patients	Intraobserver reliability (κ value)	Interobserver reliability (κ value)
Kubik and Lubahn [13]	2002	3 hand surgeons and 3 orthopaedic residents	40	0.657	0.529
Dela Rosa et al. [5]	2004	6 hand surgeons	40	0.59–0.61 (depending on number of views)	0.37–0.56 (depending of number of views)
Spaans et al. [15]	2011	5 radiologists and 8 hand surgeons	40	NA	0.496
Hansen et al. [12]	2013	2 hand surgeons, 2 residents, and 1 radiologist	43	0.54	0.11

NA = not available.