Compared to what? A joint evaluation method for assessing quality of life

Area of Science:

• Health Outcomes Research
• Psychometrics
• Behavioral Economics

Background:

• Assessing quality of life relies on subjective rating scales.
• Rating scale usage can be inconsistent, influenced by individual calibration and context.
• Understanding patient versus non-patient differences in scale use is crucial for accurate health assessments.

Purpose of the Study:

• To evaluate if a joint evaluation method stabilizes quality of life ratings by providing contextual information.
• To determine if this method aids participants in calibrating responses on a rating scale.
• To investigate scale recalibration differences between patients and non-patients.

Main Methods:

• An internet survey with 1,865 participants assessed diabetes or obesity.
• Participants used either joint evaluation (rating other items first) or single evaluation (rating target condition first).
• Ratings and rank positions were compared between evaluation types and patient/non-patient groups.

Main Results:

• Joint evaluation showed evidence of scale recalibration for obesity, but not diabetes.
• The method stabilized the rank position of the target condition for both conditions.
• Stabilizing effects on the actual rating were not consistently observed.

Conclusions:

• Joint evaluation is supported for detecting scale recalibration between patients and non-patients.
• The method's effectiveness in reducing noise in rating scale usage requires further investigation.
• Contextual information in joint evaluation influences scale use, particularly for specific health conditions.