Making sense of harms and benefits: Assessing the numeric presentation of risk information in ACOG obstetrical clinical practice guidelines.

Objective: To assess the presentation of risk information in American College of Obstetricians and Gynecologists (ACOG) obstetrical Practice Bulletins.
Methods: We reviewed B- and C-graded recommendations in Practice Bulletins published from January 2017 to March 2020. We calculated the proportion of recommendations and outcomes that were presented numerically and, of these, the proportion that were presented in accordance with best practices of risk communication - in absolute formats, or as absolute changes in risk from baseline risks. We categorized outcomes as harms or benefits to compare their risk presentation.
Results: In 21 obstetrical Practice Bulletins, there were 125 recommendations, with 46 (37%) describing risks numerically. Sixteen of these 46 recommendations (35%) presented an absolute change in risk from a baseline risk. For harms, 65% were presented as absolute risks and 25% as relative risks. For benefits, this was 55% and 48% respectively.
Conclusion: Most recommendations do not present numeric risk information. Of those that do, most do not use absolute risk measures.
Practice Implications: Obstetrical practice guidelines should present numerical risk information wherever possible to support recommendations, increasing the use of absolute risk formats and absolute changes from baseline risks to increase risk comprehension.
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