Agreement between instruments for rating treatment decisional capacity

Area of Science:

• Gerontology
• Neuroscience
• Clinical Psychology

Background:

• Assessing decisional capacity is crucial for individuals with dementia.
• Standardized instruments aim to evaluate decision-making abilities.
• Limited data exists on the comparative performance of these instruments.

Purpose of the Study:

• To evaluate the inter-rater reliability of three distinct treatment decisional capacity assessment instruments.
• To determine the level of agreement among these instruments in individuals with mild to moderate dementia.

Main Methods:

• Community-recruited participants (N=79) with mild to moderate dementia were assessed.
• Kappa statistics were employed to quantify the agreement between instruments.
• Agreement was analyzed for overall capacity and specific components (understanding, choice, reasoning, appreciation).

Main Results:

• Fair overall agreement was observed (kappa=0.451).
• Very good agreement was found for the 'understanding' component (kappa=0.618).
• Poor agreement was noted for 'choice' (kappa=0.158) and no better than chance for 'reasoning' and 'appreciation'.

Conclusions:

• Current instruments demonstrate inconsistent agreement in assessing treatment decision-making abilities in dementia.
• The 'understanding' component shows reliable assessment across instruments.
• Further refinement of instruments is needed to improve agreement for other critical decision-making components.