Table 2. NOS risk of bias scale for included cohort studies.

Studies	Selection				Outcome
	Representativeness of the exposed cohort	Selection of the non-exposed cohort	Ascertainment of exposure	Outcome of interest not present at start of study	Comparability	Assessment of outcome	Adequacy of duration of follow-up	Adequacy of completeness of follow-up	Total score (0–9)
Priori SG, et al.[7]	1	0	1	0	0	1	1	1	5
Brugada J, et al.[6]	1	0	1	1	0	1	1	1	6
Benito B, et al.[28]	1	0	1	1	0	1	1	1	6
Delise P, et al.[23]	1	0	1	1	2 (gender, family history of SCD)	1	1	1	8
Probst V, et al.[25]	1	0	1	1	0	1	1	1	6
Nishii N, et al.[22]	1	0	1	1	0	1	1	1	6
Daoulah A, et al.[21]	1	0	1	0	0	1	1	1	5
Hiraoka M, et al.[20]	1	0	1	1	2 (gender, family history of SCD)	1	1	1	8
Son MK, et al.[19]	1	0	1	0	1 (gender)	1	1	1	6
Tokioka K, et al.[18]	1	0	1	0	1 (family history of SCD)	1	1	1	6
Conte G, et al.[16]	1	0	1	1	2 (gender, family history of SCD)	1	1	1	8
Dores H, et al.[15]	1	0	1	0	2 (gender, family history of SCD)	1	1	1	7
Okamura H, et al.[17]	1	0	1	0	2 (gender, family history of SCD)	1	1	1	7
Andorin A, et al.[13]	1	0	1	1	2 (gender, family history of SCD)	1	1	1	8
Casado-Arroyo R, et al.[11]	1	0	1	1	2 (gender, family history of SCD)	1	1	1	8
Kawazoe H, et al.[12]	1	0	1	0	2 (gender, family history of SCD)	1	1	1	7
Rivard L, et al.[10]	1	0	1	1	1 (gender)	1	1	1	7
Kitamura T, et al.[8]	1	0	1	0	2 (gender, family history of SCD)	1	1	1	7
Sieira, et al.[9]	1	0	1	1	1 (gender)	1	1	1	7

NOS: Newcastle-Ottawa scale; SCD: sudden cardiac death.