Table 2.

Cronbach’s alpha and item-total statistics for persian functional rating index

FRI items	Scale mean if item deleted	Scale variance if item deleted	Corrected item-total correlation	Squared multiple correlation	Cronbach’s alpha if item deleted
Pain intensity	10.89	34.240	0.877	0.801	0.963
Sleeping	11.45	33.563	0.823	0.724	0.964
Personal care	11.02	33.353	0.852	0.780	0.963
Travel	10.83	31.819	0.852	0.753	0.963
Work	11.04	34.463	0.867	0.804	0.963
Recreation	11.07	33.399	0.846	0.735	0.963
Frequency of pain	10.57	32.591	0.812	0.750	0.964
Lifting	10.97	33.686	0.831	0.723	0.963
Walking	11.58	31.620	0.896	0.865	0.961
Standing	11.64	31.930	0.883	0.854	0.962

FRI: Functional rating index.