Table 3.

Quality assessment using the Newcastle-Ottawa Scale for cohort studies

Ref.	Selection				Comparability	Outcome			Score
	Representativeness of the exposed cohort	Selection of the nonexposed cohort	Ascertainment of exposure	Demonstration that outcome of interest was not present at start of study	Comparability of cohorts on the basis of the design or analysis	Assessment of outcome	Was follow-up long enough for outcomes to occur	Adequacy of follow up of cohorts
Janku et al[27], 2020	1	0	1	1	1	1	0	1	6