Factors associated with aseptic loosening after primary total hip arthroplasty: A systematic review and meta-analysis

Table 4 Quality assessment of included case-control studies

Ref.	Item 1	Item 2	Item 3	Item 4	Item 5	Item 6	Item 7	Item 8	Item 9	Item 10	Item 11
Amstutz et al[49], 2015	Yes	No	No	Yes	Unclear	Yes	No	Yes	Unclear	Unclear	Yes
Münger et al[14], 2006	Yes	Yes	Yes	Yes	Unclear	Yes	No	Yes	Unclear	Yes	Yes
Lunn et al[33], 2005	Yes	Yes	No	Yes	Unclear	Yes	Unclear	Yes	Unclear	Yes	Yes

For case-control studies: Item 1, Define the source of information (survey, record review); item 2, list inclusion and exclusion criteria for exposed and unexposed subjects (cases and controls) or refer to previous publications; item 3, indicate period used for identifying patients; item 4, indicate whether or not subjects were consecutive if not population-based; item 5, indicate if evaluators of subjective components of the study were masked to other aspects of the status of the participants; item 6, describe any assessments undertaken for quality assurance purposes; item 7, explain any patient exclusions from analysis; item 8, describe how confounding was assessed and/or controlled; item 9, if applicable, explain how missing data were handled in the analysis; item 10, summarize patient response rates and completeness of data collection; item 11, clarify what follow-up, if any, was expected and the percentage of patients for which incomplete data or follow-up was obtained.