Quality of Evidence Supporting the Role of Supplement Curcumin for the Treatment of Ulcerative Colitis: An Overview of Systematic Reviews

Table 4

Results of the ROBIS assessments.

Author, year (country)	Phase 1	Phase 2				Phase 3
	Assessing; relevance	Domain 1: study; eligibility criteria	Domain 2: identification; and selection of studies	Domain 3: collection; and study appraisal	Domain 4: synthesis; and findings	Risk of bias; in the review
Saurabh Chandan, 2020 (USA) [20]	√	√	√	√	×	√
Armin Ebrahimzadeh, 2021 (Iran) [21]	√	√	√	√	×	√
Ricardo de Alvares Goulart, 2020 (Brazil) [22]	√	√	×	×	×	√
Umair Iqbal, 2018 (USA) [23]	√	√	√	√	×	√
Maria G. Grammatikopoulou, 2018 (Greece) [24]	√	√	√	×	×	√
Ting Zheng, 2020 (China) [25]	√	√	×	×	×	√
Liwei Zhu, 2019 (China) [26]	√	√	×	×	×	√

Note: √, low risk; ×, high risk.