Individualized quality of life in patients with low back pain: reliability and validity of the Patient Generated Index.

Authors

  • Ida Løchting
  • Margreth Grotle
  • Kjersti Storheim
  • Erik L Werner
  • Andrew M Garratt

DOI:

https://doi.org/10.2340/16501977-1826

Keywords:

quality of life, low back pain, reliability, validity.

Abstract

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.

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Published

2014-07-14

How to Cite

Løchting, I., Grotle, M., Storheim, K., Werner, E. L., & Garratt, 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. https://doi.org/10.2340/16501977-1826

Issue

Section

Original Report