A Cross-Sectional Study Based on Forty Systematic Reviews of Foods with Function Claims (FFC) in Japan: Quality Assessment Using AMSTAR 2

Ref ID	929
First Author	H. Kamioka
Journal	NUTRIENTS
Year Of Publishing	2023
URL	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10180741/
Keywords	• Low methodological quality • Non-Cochrane reviews • Nutrition • Protocols
Problem(s)	• Insufficient literature searches • Limited quality assessment or no risk of bias • Low reporting or methodological quality (OTHER GUIDANCE) • No registered or published protocol
Number of systematic reviews included	40
Summary of Findings	From 40 included systematic reviews of foods with function claims (FFC) randomly selected from the Consumer Affairs Agency website in Japan from 1 April to 31 October 2022. Overall confidence was rated as “high” (N = 0, 0%), “moderate” (N = 0, 0%), “low” (N = 2, 5%), or “critically low” (N = 38, 95%). The mean AMSTAR 2 score was 51.1% (SD 12.1%; range 19–73%). Among the 40 systematic reviews, the number of critical domain deficiencies was 4 in 7.5% of systematic reviews, 3 in 52.5% of systematic reviews, 2 in 35% of systematic reviews, and 1 in 5% of systematic reviews. Registering the review’s protocol and comprehensive search strategies were particularly common deficiencies. Additionally, the risk of bias (RoB) was insufficiently considered.
Did the article find that the problem(s) led to qualitative changes in interpretation of the results?	N/A
Are the methods of the article described in enough detail to replicate the study?	No