Use pictograph frequency displays for comparative risk and benefit counts

Encode comparative frequencies with a pictograph-style 100-unit grid instead of text-only counts or tables when readers must compare risks and benefits. For example, show 60 of 100 outcomes as 60 colored blocks and show a 5-point change between options as five changed blocks rather than only writing percentages or listing them in a table.

A 100-unit pictograph gives readers a visible count and a visible comparison at the same time. That makes it easier to extract both the overall direction of the comparison and the exact frequencies, even when readers differ in numeracy.

Mechanism: The pictograph turns percentages into countable units, so readers can see both the total affected group and the change between options without translating text or scanning a table.

Evidence: In a randomized Internet survey of 4,685 parents, pictographs produced higher adequate gist understanding (66.4% vs 61.3% for text and 62.9% for tables) and higher adequate verbatim knowledge (66.5% vs 49.1% and 44.6%), and this advantage appeared in both low- and high-numeracy groups; pictographs were also rated more effective, helpful, trustworthy, and scientific than text or tables (Tait et al., 2010).

Notes: In the same study, pictographs also made risks seem lower and benefits seem higher than text or tables.

• User Goal: Compare the risks and benefits of two options before making a decision.
• Task: Read both the overall comparison and the approximate counts correctly.
• Data: Quantitative frequencies expressed out of 100, including small differences between options.
• Chart Setting: A static or browsable risk/benefit display where readers can review the information while answering questions.
• Audience: Lay decision-makers, including readers with lower and higher numeracy.
• Success Criterion: More readers can identify which option has more or less of each outcome and can report the approximate frequencies correctly.

Break it when: The display also adds a separate severity graphic beside each outcome. Why: In this study, the added severity cue reduced gist understanding and shifted perceived risk and benefit.

Sacrifice: You may change perceptions as well as comprehension. Risk: Readers may judge the option as less risky and more beneficial than they do from text or tables. Mitigation: Review both answer accuracy and perceived risk/benefit after switching formats.

Mistake: Replacing text with a table and expecting the same comprehension gain. Why it fails: Tables performed similarly to text and worse than pictographs on verbatim knowledge in this study.

Failure Sign: Readers cannot say which option has more or fewer outcomes, or they miss the approximate counts out of 100. Quick Check: Show the current display and a pictograph version, then ask readers who is more likely to experience each outcome and approximately how many out of 100 are affected. Stronger Test: Compare the share of readers reaching at least 3 of 4 gist answers and at least 5 of 7 verbatim answers.

• Convert each probability into a 100-block pictograph with affected and unaffected blocks distinguished visually.
• Show the comparison option as an incremental change on the same 100-unit reference rather than only as text.
• Remove text-only paragraphs or table-only summaries when the main goal is accurate comparative reading.