Table 5.

Summary of precision and risk of bias (ROB) assessment for the hepatitis C virus (HCV) incidence and prevalence measures extracted from eligible reports.

Quality assessment	HCV incidence		HCV prevalence
	n	%	n	%
Precision of estimates
High precision	3	60.0	312	77.4
Low precision	2	40.0	79	19.6
Uncleara			12	3.0
Risk of bias quality domains
HCV ascertainment
Low risk of bias	5	100	402	100
High risk of bias	0	0	0	0
Sampling methodology
Low risk of bias	0	0	48	11.9
High risk of bias	5	100	350	87.1
Unclear	0	0	4	1.0
Response rate
Low risk of bias	3	60.0	370	92.0
High risk of bias	2	40.0	10	2.5
Uncleara	0	0	22	5.5
Total studies where risk of bias assessment was possible	5	100	402	99.8
Unknown b	0	0		0.2
Total studies	5	100	403	100
Summary of risk of bias assessment for HCV prevalence measures	n	%
Low risk of bias
In at least one quality domain	402	100
In at least two quality domains	371	92.3
In all three quality domains	47	11.7
High risk of bias
In at least one quality domain	350	87.1
In at least two quality domains	10	2.5
In all three quality domains	0	0
Total studies where risk of bias assessment was possible	402	99.8
Total studies	403	100

^aStudies with missing information for any of the domains were classified as having unclear risk of bias for that specific domain.

^bStudies extracted through country-level routine reporting with limited description of the sample (not permitting the conduct of risk of bias assessment) were classified as being of unknown quality.