Binary Tönnis classification: simplified modification demonstrates better inter- and intra-observer reliability as well as agreement in surgical management of hip pathology

Table 7 Confusion Matrix for Binary Tönnis Classification System

Surgeon-Recommended Treatment	Observer 1		Observer 2		Observer 3		Observer 4		Observer 5
Surgeon-Recommended Treatment	Preservation	Replacement	Preservation	Replacement	Preservation	Replacement	Preservation	Replacement	Preservation	Replacement
A: First Round of Reads
Preservation	19	0	19	0	17	2	19	0	17	2
Replacement	5	16	4	17	3	18	5	16	5	16
B: Second Round of Reads
Preservation	19	0	19	0	16	3	19	0	16	3
Replacement	4	17	5	16	4	17	4	17	5	16

ISSN: 1471-2474