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

Table 3 Quality assessment of included cohort studies

Ref.	Selection			Comparability		Outcome			Total
	Item 1	Item 2	Item 3	Item 4	Item 5	Item 6	Item 7	Item 8
Davis et al[61], 2020	1	N/A	1	0	N/A	1	1	1	5
Benson et al[35], 2022	1	1	0	1	1	1	1	1	7
Bordini et al[15], 2007	1	0	N/A	1	1	1	1	1	6
Jud et al[42], 2024	1	1	1	1	N/A	1	1	1	7
Wagener et al[62], 2024	1	0	1	1	N/A	1	1	1	6
Budin et al[34], 2024	1	1	1	1	1	1	1	1	8
Magruder et al[32], 2024	1	1	1	1	N/A	1	1	1	7
Aro et al[13], 2012	1	1	1	1	1	1	0	0	6
Electricwala et al[23], 2016	1	0	0	1	1	1	1	1	6
Layson et al[29], 2024	1	1	N/A	1	1	1	1	1	7
Clauss et al[58], 2013	1	1	1	1	N/A	1	1	1	7
Khatod et al[43], 2014	1	1	1	1	1	1	1	1	8
Stelmach et al[45], 2015	1	1	1	1	N/A	1	1	1	7
Wedemeyer et al[44], 2009	1	0	1	1	N/A	1	1	1	6
Lee et al[56], 2024	1	1	1	1	1	1	1	1	8
Halawi et al[26], 2016	1	N/A	0	1	1	1	1	1	6
Boyer et al[19], 2019	1	1	1	0	1	1	1	1	7

For cohort studies: Selection: Item 1, representativeness of the exposed cohort; item 2, selection of the non-exposed cohort; item 3, ascertainment of exposure; item 4, demonstration that outcome of interest was not present at start of study; Comparability: Item 5, comparability of cohorts on the basis of the design or analysis; Outcome: Item 6, assessment of outcome; item 7, was follow-up long enough for outcomes to occur; item 8, adequacy of follow up of cohorts. N/A: Not applicable.