Utility Values for the CP-6D, a Cerebral Palsy-Specific Multi-Attribute Utility Instrument, Using a Discrete Choice...

Area of Science:

• Health Economics
• Rehabilitation Medicine
• Psychometrics

Background:

• The Cerebral Palsy Quality of Life (CPQOL) questionnaire has been adapted into the CP-6D, a new preference-based measure.
• The CP-6D requires a preference-based value set for utility scoring and cost-utility analysis (CUA).

Purpose of the Study:

• To estimate a utility value set for the CP-6D to facilitate CUA of interventions for individuals with cerebral palsy (CP).

Main Methods:

• A discrete choice experiment was conducted with 2002 adult Australian online panelists.
• Respondents evaluated 12 choice sets, each combining CP-6D health states and duration before death.
• Conditional and mixed logit regression models were used to estimate utility values.

Main Results:

• Dimension levels generally showed monotonic effects, reflecting ordered preferences.
• Manual ability, social well-being, and acceptance significantly influenced choices.
• The worst health state ('pits') was valued at -0.582.

Conclusions:

• This study presents the first CP-specific utility value set for the CP-6D.
• This value set can be applied in CUA for CP interventions, both prospectively and retrospectively, where CPQOL has been used.