Risk factors for hepatocellular carcinoma associated with hepatitis C genotype 3 infection: A systematic review

Table 3 The Newcastle-Ottawa Scale assessment for included studies

Ref.	Type of Study	Selection								Comparability	Exposure						Total score
		Adequate case definition1	Representativeness of cases1	Selection of controls1	Definition of controls1	Representative of exposed cohort2	Selection of non-exposed cohort2	Ascertainment of exposure2	Demonstration that outcome of interest was not present at start of study2	Comparability based on the design or analysis	Ascertainment of exposure1	Same method of ascertainment for participants1	Nonresponse rate1	Assessment of outcome2	Was follow-up long enough for outcomes to occur2	Adequacy of follow up of cohorts2
Aziz et al[27], 2019	Cross-Sectional	NA	NA	NA	NA	*	*	*	*	*	NA	NA	NA	*		*	7
Cha et al[29], 2016	Cohort	NA	NA	NA	NA	*	*	*	*	*	NA	NA	NA	*	*	*	8
Khan et al[30], 2009	Case-control	*			*	NA	NA	NA	NA	*	*	*	*	NA	NA	NA	6
Kanwal et al[19], 2014	Cohort	NA	NA	NA	NA	*	*	*	*	*	NA	NA	NA	*	*	*	8
Maryam et al[32], 2018	Case-control				*	NA	NA	NA	NA			*	*	NA	NA	NA	3
Park et al[35], 2019	Cohort	NA	NA	NA	NA	*	*	*	*	*	NA	NA	NA	*	*	*	8
Tayyab et al[34], 2020	Cohort	NA	NA	NA	NA	*	*	*	*	*	NA	NA	NA	*	*	*	8

¹For case-control studies.

²For cohort or cross-sectional studies.

NA: Not applicable.