DESCRIPTION OF THE QUALITY OF LIFE INDEX (QLI)
The Quality of Life Index (QLI) was developed by Ferrans and Powers to measure quality of life in terms of satisfaction with life (Ferrans & Powers, 1985). Quality of life is defined by Ferrans as "a person's sense of well-being that stems from satisfaction or dissatisfaction with the areas of life that are important to him/her" Ferrans, 1990, p.15). The QLI measures both satisfaction and importance of various aspects of life. Importance ratings are used to weight the satisfaction responses, so that scores reflect the respondents' satisfaction with the aspects of life they value. Items that are rated as more important have a greater impact on scores than those of lesser importance. The instrument consists of two parts: the first measures satisfaction with various aspects of life and the second measures importance of those same aspects. Scores are calculated for quality of life overall and in four domains: health and functioning, psychological/ spiritual, social and economic, and family (Ferrans, 1996; Ferrans & Powers,1985; Ferrans & Powers, 1992; Ferrans, 1990; Warnecke, Ferrans, Johnson, & et al., 1996).
A number of versions of the QLI have been developed for use with various disorders and the general population, and have been reported in more than 200 published studies. A common set of items forms the basis for all versions, and items pertinent to each disorder have been added to create the illness-specific versions. Scores for all versions range from 0 - 30, which facilitates comparisons of findings across different versions. General population data are available for interpretive purposes.
Reliability, Validity, and Sensitivity
Fees for use
Contact name and address
Ferrans, C., & Powers, M. (1985). Quality of Life Index: Development and psychometric properties. Advances in Nursing Science, 8, 15-24.
Ferrans, C., & Powers, M. (1992). Psychometric assessment of the Quality of Life Index. Research in Nursing and Health, 15, 29-38.
Ferrans, C. E. (1990). Development of a quality of life index for patients with cancer. Oncology Nursing Forum, 17(3), 15-19.
Warnecke, R., Ferrans, C., Johnson, T., et. al. (1996). Measuring quality of life in culturally diverse populations. Journal of the National Cancer Institute Monographs, 20, 29-38.