Percutaneous transhepatic cholangiography vs endoscopic ultrasound-guided biliary drainage: A systematic review

Table 3 Quality of identified studies

Ref.	Criteria									Overall appraisal
	C1	C2	C3	C4	C5	C6	C7	C8	C9
Artifon et al[23]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Unclear	Yes	Included
Bapaye et al[24]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Included
Khashab et al[25]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Included
Giovannini[26]	Unclear	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Included
Jung et al[27]	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Unclear	Yes	Included
Sharaiha et al[28]	Yes	Yes	Yes	Yes	Yes	Unclear	Yes	Yes	Yes	Included

C1: Did the study sample represent the target population? C2: Were participants in the study appropriately recruited? C3: Was the sample size adequate? C4: Were the study subjects and study setting described in detail? C5: Did the data analysis cover a sufficient portion of the identified population? C6: Were objective and standard criteria used to measure the condition of interest? C7: Was the condition reliably measured? C8: Was the statistical analysis appropriate? C9: Were all important confounding factors/subgroups/differences identified and taken into account?