Table 2.

Details of Newcastle–Ottawa Scale (NOS)

NOS items / Study ID	Is the case definition adequate?	Representativeness of the cases	Selection of controls	Definition of controls	Compatibility	Ascertainment of Exposure	Same method of ascertainment for cases and control	Non-response Rate	Total Score
Carretero 2007 [27]	*	*	*	*	**		*	*	8
Yildizhan 2009 [28]		*		*	*	*	*	*	6
Muscogiuri 2010 [29]	*	*	*	*	**			*	7
Bellia 2013 [30]	*	*	*	*	**	*	*	*	9
Esteghamati 2014 [31]	*	*	*	*		*	*	*	7
Boonchaya-anant 2014 [32]	*	*	*	*	**			*	7
Kozakowski 2014 [34]	*	*	*	*	**	*	*		8
Amena Sadiya 2014 [33]	*	*			**	*	*	*	7
Bellan 2014 [35]	*	*	*	*				*	6
Bril 2015 [36]	*	*	*	*	**	*	*	*	9
Lu 2015 [37]	*			*	**	*	*	*	7
Ter horst 2016 [38]		*	*	*		*	*	*	6
Mousa 2017 [39]	*	*	*	*	**				6
Piantanida 2017 [40]	*	*	*	*		*	*	*	7
Ong 2018 [41]	*	*		*	**	*	*	*	8
Curvello-Silva 2020 [42]	*	*	*		**			*	6
Setayesh 2021 [43]	*	*	*			*	*	*	6
Minna F. Schleu 2021 [22]	*	*	*	*	**	*			7
Lara A da C. Dominoni 2022 [21]			*	*	*	*	*	*	6
Salah Gariballa 2022 [20]	*	*	*	*	*	*		*	7
Tong Gong 2022 [44]	*	*		*	*	*	*	*	7

One asterisk presents one score, higher scores indicating higher quality of study. A study can be awarded a maximum of one asterisk for each numbered item excepts Comparability, a maximum of two asterisk can be given for Comparability