Cap-assisted endoscopy for esophageal foreign bodies: A meta-analysis

Table 3 Quality assessment using cochrane risk of bias tool for randomized studies

Randomized controlled trials
Ref.	Random sequence generation	Allocation concealment	Blinding	Blinding outcome assessment	Incomplete outcome data	Selective reporting	Other bias
Zhang et al[19], 2013	Unclear	Unclear	Unclear	Unclear	Low	Low	Low
Ooi et al[12], 2021	Low	Low	High	Unclear	Low	Low	low

Risk of bias assessment: 0: No information; 1: Low; 2: Moderate; 3: Serious; 4: Critical.