Understanding, Confidence and Usefulness of Effect Size and Certainty of Evidence: A Cross-Sectional Survey Among Australian Dietitians

Australian dietitians showed limited understanding of effect size, with correct comprehension higher for absolute than relative estimates (30.0% vs 18.2%) in a small 13-completer survey.

• Why it matters: Effect size interpretation is central to evidence-informed dietetic care, but competency levels among dietitians were previously unestablished.
• What they did: A web-based cross-sectional survey (Oct 2024–Feb 2025) tested understanding using RD, risk in treatment vs risk in control, NNT, RR, and OR, plus confidence, perceived usefulness, and certainty ratings.
• The result: Understanding was highest for risk in treatment vs risk in control (41.7%) and lowest for RD, RR, and OR (18.2% each); confidence peaked for RR (4.18) and was lowest for NNT (3.40), while certainty was rated useful (5.69).

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