Interpreting Perceived Effectiveness: Understanding and Addressing the Problem of Mean Validity.

Area of Science:

• Health Communication
• Social Psychology
• Research Methodology

Background:

• Perceived message effectiveness (PE) is often used as a proxy for actual message impact.
• However, the interpretation of mean PE scores lacks sufficient attention and validation.
• Understanding biases in PE is crucial for accurate assessment of communication strategies.

Purpose of the Study:

• To address the problem of mean validity in perceived message effectiveness.
• To present a research design for evaluating biases in PE.
• To offer recommendations for applied researchers on preferred PE indices.

Main Methods:

• A study involving 195 participants who viewed messages promoting colorectal cancer screening.
• Analysis of perceived message effectiveness across different demographic groups and judgment referents.
• Investigating biases in PE based on audience characteristics and abstractness of the judgment referent.

Main Results:

• Downward bias in PE was observed among younger individuals (non-target audience).
• Upward bias in PE increased as the judgment referent became more abstract (self < older adults < general population).
• These findings indicate systematic biases influencing PE scores.

Conclusions:

• Mean PE scores can be biased, affecting the interpretation of message effectiveness.
• Further research on mean validity is necessary for accurate assessment in health communication.
• Applied researchers should carefully select and interpret PE indices to avoid misinterpretations.