Establishing the Psychometric Properties of the ICOAP Questionnaire through Intra-Articular Treatment of Osteoarthritic Pain: Implementation for the Greek Version

Table 8

Reliability.

	Internal consistency
	(Cronbach’s-alpha coef.) ()
ICOAP scales	Phase A	Phase C	Test-retest
			(Intraclass correlation coef.)
			On average measures ()
Constant pain (5 items)	0.959	0.956	0.910
	If item is deleted
1	0.944	0.946
2	0.942	0.939
3	0.969	0.961
4	0.946	0.941
5	0.941	0.937
Intermittent pain (6 items)	0.914	0.923	0.877
	If item is deleted
6	0.899	0.922
7	0.896	0.908
8	0.920	0.919
9	0.890	0.903
10	0.894	0.899
11	0.893	0.899
Total pain (11 items)	0.878	0.911	0.880