Table. 8. Table 8

Assessment of risk of bias for non-randomized clinical trials using the Cochrane Risk of Bias 2 tool

Reference	Risk domain
	Bias because of confounding	Bias because of the selection of participants	Bias in the classification of intervention	Bias because of deviations from the intended intervention	Bias because of missing outcome data	Bias in outcome measurement	Bias in the selection of reported results	Overall risk of bias
Drisko et al., 2006	High	Low	Some concerns	Low	Some concerns	Low	Low	High
Xinias et al., 2018	High	Low	Low	Low	Low	Low	Low	High
Ohigashi et al., 2011	High	Low	Some concerns	Low	Some concerns	Low	Some concerns	High
Di Pierro et al., 2020	High	Low	Low	Low	Low	Low	Low	High

Prev Nutr Food Sci 2024;29:237~255 https://doi.org/10.3746/pnf.2024.29.3.237