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The Quality of Life Index

The Quality of Life Index. A Literature Survey of the Usage and Results from the Ferrans and Powers QLI. Ferrans/Powers QLI. The Ferrans/Powers QLI was created in 1984 There are Five Scores, including an Overall Score and Four Domains

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The Quality of Life Index

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  1. The Quality of Life Index • A Literature Survey of the Usage and Results from the Ferrans and Powers QLI

  2. 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

  3. The Four Domains • Health and Functionality • Socioeconomic • Psychological and Spiritual • Family

  4. Satis. Satis. Satis. Imp. Imp. Imp. = 2 -1.5 -1.5 5 5 5 -7.5 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: Centering: Multiplication:

  5. 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

  6. Alpha Results • Alpha > .70 is generally considered Reliable • QLI obtained Alphas from .73 to .99 through 48 studies

  7. 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)

  8. Correlation • Short-Form 36 (Another QOL Index) • Disease Specific Wellness Indices • e.g. Daytime Sleepiness (Hemodialysis), Jalowiec Coping Scale, 6MW (Pulmonary Rehab)

  9. Consistency • 20 - SD 5 (Pulmonary Rehab) • 21.4 - SD 6.1 (Elderly ICU) • 22.8 - SD 4.0 (Hemodialysis) • Scores can Easily range +/- 100

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