Validation of the functional rating index for the assessment of athletes with neck pain

Table 1 Summary of clinical data in athletes with neck pain (n = 100)

Outcome measures	Mean	SD	Range
			Minimum	Maximum
PFRI	30.85	15.94	10.00	92.500
PNDI	30.22	15.93	8.00	88.00
NRS	Median (IQR) 2 (2-3)

PFRI: Persian functional rating index; PNDI: Persian neck disability index; NRS: Numerical rating scale; IQR: Interquartile range.

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.

Table 3 Results of relative and absolute reliability measures for the Persian Functional Rating Index in athletes with neck pain (n = 50)

Scale	Mean ± SD		d (SD)	ICCagreement (95%CI)	SEM	SDC
	Test	Retest
PFRI	32.15 ± 19.04	30.70 ± 15.90	1.45 (4.95)	0.96 (0.93-0.98)	3.2	8.84

d: Mean difference of the test and retest scores; ICC: Intraclass correlation coefficient; SEM: Standard error of measurement; SDC: Smallest detectable change; PFRI: Persian Functional Rating Index.