Table 3.

Risk of bias assessment for case–control studies.

First author, year	Selection				Comparability	Exposure			Total points (/9)
	Adequate case definition	Representativeness of the cases	Control selection	Definition of controls	Comparability of Cases and Controls on the Basis of the Design or Analysis	Ascertainment of exposure	Non-response rate	Similar method of ascertainment for cases and control
Dong 2020	Yes	Yes	Community controls	No history of disease	Study controls for risk factors for aortic aneurysm but lacks other important risk factors (smoking)	Medical records	N.A	Yes	7/9
Lee2015	Yes	Yes	Community controls	No history of disease	Study controls for risk factors for aortic aneurysm but lacks other important risk factors (smoking)	Medical records	N.A	Yes	7/9
Lee2018	Yes	Yes	Community controls	No history of disease	Study controls for risk factors for aortic aneurysm but lacks other important risk factors (smoking)	Medical records	N.A	Yes	7/9
Maumus-Robert 2019	Yes	Yes	Community controls	No history of disease	Study controls for risk factors for aortic aneurysm but lacks other important risk factors (smoking)	Medical records	N.A	Yes	7/9