Table 3

Newcastle–Ottawa scale for cohort studies

Study ID	Selection				Comparability	Exposure			Total score
Study ID	Is the case definition adequate?	Representativeness of cases	Selection of controls	Definition of controls	Comparability of cases and controls on the basis of design or analysis	Ascertainment of exposure	Same method of ascertainment of cases and controls	Non-response rate	Total score
Ahmadpour-Kacho_2014_Iran	*	*	*	*	**	*	*	*	9
Auerbach_2013_Israel	*	*	*	*	**	*	*	*	9
Bermick_2016_USA	*	*	*	*	**	*	*	*	9
Chavez-Valdez_2011_USA	*	*	*	*	**	*	*	*	9
Ertl_2006_Hungary	*	*	*	*	**	*	*	*	9
Garg_2003_USA	*	*	*	*	**	*	*	*	9
Hays_2006_USA	*	*	*	*	**	*	*	*	9
Kaempf_2011_USA	*	*	*	*	**	*	*	*	9
Kim_2017_Korea	*	*	*	*	**	*	*	*	9
Lee_2016_USA	*	*	*	*	**	*	*	*	9
Manzoni_2006_Italy	*	*	*	*	**	*	*	*	9
Mohamed_2013_USA	*	*	*	*	**	*	*	*	9
Naseh_2017_Sweden⁺	*		*	*			*		4
Reyes_2017_Oman	*	*	*	*	**	*	*	*	9
Slidsborg_2018_Denmark	*	*	*	*	**	*	*	*	9
Sutija_2004_USA⁺	*	*	*	*		*	*	*	7
van der Merwe _2013_South Africa	*	*	*	*	**	*	*	*	9

+Abstract only.