Table 4.

Cohort Critical appraisal

	Dallinga J. 2019 [80]	Bach DK. 1985 [72]	Buist I. 2008 [73]	Lysholm J. 1987 [74]	Tauton JE. 2003 [75]	Van der Worp MP. 2016 [77]	Messier SP. 2018 [79]	Kluitenberg B. 2015 [76]	Von Rosen P. 2017 [78]	Walter SD. 1989 [81]
Were the two groups similar and recruited from the same population?	Yes	Yes	Not applicable	Yes	Not applicable	Not applicable	Yes	Not applicable	Not applicable	Not applicable
Were the exposures measured similarly to assign people to both exposed and unexposed groups?	Yes	Yes	Not applicable	Yes	Not applicable	Not applicable	Yes	Not applicable	Not applicable	Not applicable
Was the exposure measured in a valid and reliable way?	Yes	Yes	Yes	Yes	Unclear	Unclear	Yes	Unclear	Unclear	Unclear
Were confounding factors identified?	Yes	Unclear	Yes	Unclear	Yes	Yes	Yes	Yes	Yes	Yes
Were strategies to deal with confounding factors stated?	Unclear	Unclear	Yes	Unclear	Yes	Yes	Yes	Yes	Yes	Yes
Were the groups/participants free of the outcome at the start of the study (or at the moment of exposure)?	Unclear	Yes	Unclear	Yes	Unclear	Unclear	Yes	Yes	Unclear	Unclear
Were the outcomes measured in a valid and reliable way?	Yes	Yes	Yes	Unclear	Yes	Yes	Yes	Yes	Yes	Yes
Was the follow up time reported and sufficient to be long enough for outcomes to occur?	Yes	Not applicable	Unclear	Yes	Yes	Yes	Yes	Unclear	Yes	Yes
Was follow up complete, and if not, were the reasons to loss to follow up described and explored?	Yes	Not applicable	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Were strategies to address incomplete follow up utilized?	Yes	Not applicable	Yes	Not applicable	Unclear	No	Yes	Yes	Not applicable	Yes
Was appropriate statistical analysis used?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes