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Average grade level readability of online patient education material (OPEM) by category of publication. Each circle represents a readability score for one OPEM, with a total of five readability scores for each unique OPEM. 95% CIs are included for all categories except “Clinic” and “Other,” which only had one unique OPEM each. University and government sources were significantly more readable than research and nonprofit foundation, industry, and lay press sources.
