Lymphedema Quality of Life Inventory (LyQLI)-Development and investigation of validity and reliability
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The purpose of this study was to reduce the 188-item Swedish Lymphedema Quality of Life Inventory (SLQOLI) to an abbreviated, clinically useful version (phase 1) and to test it for reliability and validity (phase 2).
In phase 1 correlation analysis, factor analysis, content validity assessment and expert panels were used to reduce the number of items in SLQOLI to 45 items, which was named, Lymphedema Quality of Life Inventory (LyQLI). In phase 2, LyQLI was sent to 200 patients with lymphedema. 126 patients completed the questionnaire twice to determine stability of the instrument over time. SF-36 was sent to the patients once, correlations between the three domains in LyQLI and the two sum scores Physical Health (PCS) and Mental Health (MCS) in SF-36 were used to assess concurrent validity.
The 188-item SLQOLI was reduced to 45-item LyQLI. Four domains were reduced to three: physical, psychosocial and practical. Reliability estimates using ICC for the physical and psychosocial domains were 0.88 (p < 0.01) and 0.87 (p < 0.01), for the practical domain 0.87 (p < 0.01). Cronbach’s alpha coefficients for the three domains were 0.88, 0.92 and 0.88, respectively. The physical domain correlated highly significantly with PCS, psychosocial highly significantly with MCS and practical equally highly significantly to both PCS and MCS. Using skewness coefficients, small floor effects in the items were found.
The shorter LyQLI demonstrated good reliability and validity with potential use to assess quality of life in clinic settings and in further cross-sectional studies of patients with lymphedema.
KeywordsHealth-related quality of life Lymphedema Disease-specific instrument Reliability Validity
This study was supported by research grants from the Cancer Foundation in Sweden. The authors would also like to thank all the patients for their participation.
- 18.Sullivan, M., Karlsson, J., Taff, C., & Ware, J. E. (2002). SF-36 hälsoenkät: Svensk manual ochTolkningsguide, 2:a upplagan (Swedish Manual and Interpretation Guide (2nd ed.). Gothenburg: Sahlgrenska University Hospital.Google Scholar
- 19.http://www.sf-36.org/. Accessed 17 April 2013.
- 20.http://instruct.uwo.ca/kinesiology/9641/Assessments/Social/NHP.html. Accessed 17 April 2013.
- 28.Launois, R., Mègnigbêto, A. C., Pocquet, K., Alliot, F., Campisi, C., Witte, M. H., et al. (2002). A specific quality of life scale in upper limb lymphedema: the ULL-27 questionnaire. Lymphology, 35, 181–187.Google Scholar
- 31.Keeley, V., Crooks, S., Locke, J., Veigas, D., Riches, K., & Hilliam, R. (2010). A quality of life measure for limb lymphoedema (LYMQOL). Journal of Lymphoedema, 5(1), 26–37.Google Scholar
- 33.Streiner, D. L., & Norman, G. R. (1998). Health measurement scales a practical guide to their development and use. Oxford: Oxford medical publications.Google Scholar
- 35.Svensson, E. (2012). Different ranking approaches defining association and agreement measures of paired ordinal data.Wileyonlinelibrary.com doi: 10.1002/sim.5382. Accessed 24 April 2013.
- 36.Altman, D. G. (1991). Practical statistics for medical research (1st ed.). London: Chapman & Hall.Google Scholar
- 38.Draper, S.W. (2002). The Hawthorne, Pygmalion, Placebo and other effects of expectation: some notes. URL: http://www.psy.gla.ac.uk/~steve/hawth.html. Accessed 25 June 2013.
- 39.Domholdt, E. (2005). Rehabilitation research (3d ed., p. 358). St. Louis, MI: Elsevier Saunders.Google Scholar