Individualized quality of life in patients with low back pain: reliability and validity of the Patient Generated Index
Journal article, Peer reviewed
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https://hdl.handle.net/10642/2422Utgivelsesdato
2014Metadata
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Originalversjon
Løchting, I., Grotle, M., Storheim,K., Werner, E.L. & Garrat, A.M. (2014). Individualized quality of life in patients with low back pain: reliability and validity of the Patient Generated Index. Journal of Rehabilitation Medicine, 46(8), 781-787. doi:10.2340/16501977-1826 http://dx.doi.org/10.2340/16501977-1826Sammendrag
Objective: To evaluate the reliability and validity of the improved
version of the Patient Generated Index (PGI) in patients
with low back pain.
Methods: The PGI was administered to 90 patients attending
care in 1 of 6 institutions in Norway and evaluated for reliability
and validity. The questionnaire was given out to 61
patients for re-test purposes.
Results: The PGI was completed correctly by 80 (88.9%)
patients and, of the 61 patients responding to the re-test,
50 (82.0%) completed both surveys correctly. PGI scores
were approximately normally distributed, with a median of
40 (range 80), where 100 is the best possible quality of life.
There were no floor or ceiling effects. The 5 most frequently
listed areas affecting quality of life were pain, sleep, stiffness,
socializing and housework. The test-retest intraclass correlation
coefficient was 0.73. The smallest detectable changes
for individual and group purposes were 32.8 and 4.6, respectively.
The correlations between PGI scores and other instrument
scores followed a priori hypotheses of low to moderate
correlations.
Discussion: The PGI has evidence for reliability and validity
in Norwegian patients with low back pain at the group
level and may be considered for application in intervention
studies when a comprehensive evaluation of quality of life is
important. However, the smallest detectable change, of approximately
30 points, may be considered too large for individual
purposes in clinical applications