Visual aids improve diagnostic inferences and metacognitive judgment calibration

Area of Science:

• Medical decision making
• Health risk communication
• Metacognition

Background:

• Visual aids can enhance understanding of medical risks.
• Assessing comprehension accuracy (calibration) is crucial for informed decisions.
• Numeracy influences risk interpretation and self-assessment accuracy.

Purpose of the Study:

• To investigate if visual aids improve diagnostic inference accuracy and metacognitive judgment calibration.
• To examine the role of numeracy in risk comprehension with and without visual aids.

Main Methods:

• 108 patients made diagnostic inferences based on medical test information (sensitivity, false-positive rate, prevalence).
• Participants were divided into two groups: numerical information only vs. numerical information with a visual aid (grid).
• Assessed inferential accuracy and metacognitive judgment calibration, controlling for numeracy.

Main Results:

• Without visual aids, low numeracy patients misinterpreted test values and overestimated their accuracy.
• Visual aids improved inferential accuracy and calibration across all numeracy levels.
• Metacognitive judgment calibration mediated the link between numeracy and inference accuracy.

Conclusions:

• Visual aids enhance risk communication by improving both comprehension and self-assessment accuracy.
• Metacognition is key to understanding the benefits of visual aids and numeracy in risk literacy.
• Well-designed risk communications empower patients with health information and self-assessment skills.