Aqol-6D

Quicklinks

• AQoL-6D questionnaire
• Scoring the AQoL-6D
• Diagram of the AQoL-6D Structure

References

Construction of Descriptive System

• Richardson J, Peacock S, Hawthorne G, Iezzi A, Elsworth G & Atherton Day N. (2012). 'Construction of the descriptive system for the assessment of quality of life AQoL-6D utility instrument'. Health and Quality of Life Outcomes, 10(38). doi:10.1186/1477-7525-10-38

Construction of Utility Weights

• Richardson J, Atherton Day N, Peacock S, & Iezzi A. (2004). 'Measurement of the Quality of Life for Economic Evaluation and the Assessment of Quality of Life (AQoL) Mark 2 Instrument'.    Australian    Economic    Review, 37: 62–88. doi: 10.1111/j.1467-8462.2004.00308.x

Validity, Reliabilty, Transformations

• Richardson J. 2010. Psychometric Validity and Multi Attribute Utility (MAU) Instruments, Research Paper 57, Centre for Health Economics, Monash University,    Melbourne.
• Test-retest reliabilty coefficients - page 36 in Richardson J, Chen, G, Iezzi, A & Khan, M. (2011). Transformations between the Assessment of Quality of Life AQoL Instruments and Test-Retest Reliability. Centre for Health Economics, Monash University, Melbourne.

Norms

• Maxwell, A, Özmen, M, Iezzi, A, & Richardson, JR (2016). Deriving population norms for the AQoL-6D and AQoL-8D multi attribute utility instruments from web-based data. Quality of Life Research. DOI 10.1007/s11136-016-1337-z

Conceptualisation

• WHO concept of Handicap.

Description

• 6 separately scored dimensions, with variable item numbers and response levels.
• A simple global ‘utility’ score
• Increased sensitivity in the range of good health

Dimensions

• Independent Living - household tasks, mobility outside the home, walking and self-care;
• Relationships - friendships, family and community role;
• Mental Health - feelings of despair, worry, sadness, tranquility/agitation;
• Coping - covering having enough energy, being in control and coping with problems;
• Pain - the frequency of pain, the degree of pain and the interference with usual activities caused by pain;
• Senses - seeing, hearing and communication.

Construction

Descriptive System

• Structural Equation Modelling of the construction item bank  completed by a representative sample of 316 members of the public across SEIFA groups and
  312 hospital patients.
• Items were collected as for AQoL-4D.

Scaling System

• TTO and PTO interviews were done with 361 randomly selected members of the public across SEIFA groups to determine utility weights for items, dimensions and AQoL “all worst”
• Multiplicative models to combine items into dimensions
• Multiplicative model to combine dimensions into a ‘stage 1’ single index.
• Econometric analysis to correct stage 1 estimates to produce a stage 2 index.

Timing

• AQoL-6D takes about 2-3 minutes to complete.

Research team

• J Richardson (team leader), N Day, G Hawthorne, S Peacock, A Iezzi