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The validity and reliability of the functional rating index for evaluating low back pain in athletes
Author(s) -
Naghdi S.,
Nakhostin Ansari N.,
Yazdanpanah M.,
Feise R. J.,
Fakhari Z.
Publication year - 2015
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.12447
Subject(s) - athletes , medicine , physical therapy , construct validity , cronbach's alpha , convergent validity , reliability (semiconductor) , low back pain , concurrent validity , clinical psychology , psychometrics , internal consistency , power (physics) , physics , alternative medicine , pathology , quantum mechanics
The purpose of the present study was to determine the reliability and validity of the F unctional R ating I ndex ( FRI ) for athletes with low back pain ( LBP ). In this cross‐sectional and prospective cohort study, the validated P ersian FRI ( PFRI ) was tested in 100 athletes with LBP and 50 healthy athletes. From the athletes with LBP , data were recollected among 50 athletes with a 7‐day interval to examine test‐retest reliability. The content validity was excellent, and the athletes with LBP responded to all items with no floor or ceiling effects. The discriminative validity was supported by a statistically significant difference in PFRI total scores between the athletes with LBP and healthy athletes. The concurrent criterion validity was good (rho = 0.72). The construct, convergent validity was good ( r = 0.83). The internal consistency reliability estimate was high (Cronbach's α = 0.90). Factor analysis demonstrated a single‐factor structure with an explained variance of 52.22%. The test‐retest reliability was excellent, indicated by an ICC agreement of 0.97, and the agreement observed in the B land and A ltman plot demonstrated no systematic bias. It is concluded that the PFRI has excellent psychometric properties for assessing athletes with LBP .