TABLE 1.

Quality assessment: NOS for cohort studies¹

	Selection				Comparability	Outcome
Study, year (ref)	Representativeness of the exposed cohort	Selection of the unexposed cohort	Ascertainment of exposure	Demonstration that the outcome of interest was not present at the start of the 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	Total
Vercambre et al., 2009 (27)	*	*		*	**		*	*	*******
Ozawa et al., 2014 (28)	*	*		*	**	*	*	*	********
Lana et al., 2015 (12)	*	*	*	*	*	*	*	*	********
Kesse-Guyot et al., 2016 (29)		*	*		**	*	*		******
Petruski-Ivleva et al., 2017 (30)		*	*	*	**	*	*		*******

¹NOS high-quality choices are identified with a star. A maximum of 1 star is applied for each item within the Selection and Outcome categories, and a maximum of 2 stars for Comparability. NOS, Newcastle-Ottawa Scale; ref, reference.