the quality of life index a literature survey of the usage and results from the ferrans and powers...
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The Quality of Life Index
A Literature Survey of the Usage and Results from the Ferrans and Powers QLI
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Ferrans/Powers QLI
•The Ferrans/Powers QLI was created in 1984
•There are Five Scores, including an Overall Score and Four Domains
•There is a General Format as well as 14 Disease Specific Versions
•The QLI has been used in over 200 Published Studies
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The Four Domains
•Health and Functionality
•Socioeconomic
•Psychological and Spiritual
•Family
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How It Works
•Satisfaction / Importance
•Satisfaction data is centered, giving positive and negative numbers
•Satisfaction is multiplied by Raw Importance
•All numbers added together to produce final results
Level of Pain:
Satis. Imp.2 5
Centering: Satis. Imp.-1.5 5
Multiplication: Satis. Imp. =-1.5 5 -7.5
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Cronbach’s Alpha
• A test to compare the sum of a given set of data to the expected sum within a generalized set of data
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Alpha Results
•Alpha > .70 is generally considered Reliable
•QLI obtained Alphas from .73 to .99 through 48 studies
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Common Sense
•Subjects who self-report Depression generally rank lower on QLI (Ferrans 1990)
•Subjects with Higher Incomes generally rank higher on QLI (Ferrans, Powers 1992)
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Correlation
•Short-Form 36 (Another QOL Index)
•Disease Specific Wellness Indices
•e.g. Daytime Sleepiness (Hemodialysis), Jalowiec Coping Scale, 6MW (Pulmonary Rehab)
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Consistency
•20 - SD 5 (Pulmonary Rehab)
•21.4 - SD 6.1 (Elderly ICU)
•22.8 - SD 4.0 (Hemodialysis)
•Scores can Easily range +/- 100