[Information on mammography screening--from deception to insight]

Area of Science:

• Medical Screening
• Public Health Communication
• Evidence-Based Medicine

Background:

• Mammography screening is a key tool for breast cancer detection.
• Effective communication of screening outcomes is crucial for informed patient decisions.
• Current communication often lacks balance, potentially leading to biased understanding.

Purpose of the Study:

• To outline principles for unbiased communication of mammography screening information.
• To ensure patients receive comprehensive data on benefits and harms.
• To promote evidence-based decision-making in cancer screening.

Main Methods:

• Review of evidence on mammography screening effectiveness (mortality reduction).
• Analysis of mammography test performance metrics (sensitivity, specificity, predictive values).
• Evaluation of potential harms including false positives, false negatives, overdiagnosis, and overtreatment.

Main Results:

• Effective communication requires presenting both benefits (e.g., reduced breast cancer mortality) and harms (e.g., overdiagnosis, overtreatment).
• Data should be communicated using natural frequencies, not relative differences, to avoid framing effects.
• Equal emphasis must be given to those likely to benefit and those unlikely to benefit or likely to be harmed.

Conclusions:

• Unbiased presentation of mammography screening data is essential for informed decision-making.
• Communicating outcomes as natural frequencies enhances understanding of screening effectiveness and risks.
• A balanced approach, highlighting both benefits and harms, supports patient autonomy in screening choices.