TABLE 2.

The Newcastle-Ottawa Quality Assessment Scale.

References	Selection				Comparability	Exposure			Scores
	Adequate definition of cases	Representativeness of the cases	Selection of controls	Definition of controls	Control for important factor*	Ascertainment of exposure	Same method of ascertainment of exposure	Non-response rate
Shi et al., 2020	*	*	*	–	**	*	*	–	7
Sergott et al., 2021	*	*	*	*	**	*	*	–	8
Rotenstreich et al., 2019	*	*	*	*	**	*	*	–	8
Uchida et al., 2020	*	*	*	*	*	*	*	–	7
Donix et al., 2021	*	*	*	*	*	*	*	–	7
Tao et al., 2019	*	*	*	*	*	*	*	–	7
Zhao et al., 2020	*	*	*	*	*	*	*	–	7
López-Cuenca et al., 2022	*	*	*	*	**	*	*	–	8
Mathew et al., 2022	*	*	*	*	*	*	*	–	7

* A maximum of two stars can be allotted in this category, one for age, the other for other controlled factors.