Table 2.

Newcastle-Ottawa scale scores and quality assessment of included studies

Study	Selection				Comparability	Outcome			Quality*
	Representativeness	Selection	Ascertainment	Outcome		Assessment	Follow-up	Adequacy
Selmer 199214	*	*	*	—	**	*	*	*	Good (8)
Glasgow Alumni 200017	*	*	*	*	**	*	*	*	Good (9)
CHA 200123	*	*	*	*	**	*	*	*	Good (9)
Strandberg 200113	*	*	—	*	**	*	*	*	Good (8)
MRFIT 200222	*	*	*	*	**	*	*	*	Good (9)
Falkstedt 200816	*	*	*	*	**	*	*	*	Good (9)
Sauvaget 201021	—	*	*	—	*	*	*	*	Fair (6)
HAHS 201115	*	*	*	*	**	*	*	*	Good (9)
Sundstrom 201110	*	*	*	*	**	*	*	*	Good (9)
CARDIA 20189	*	*	*	*	**	*	*	*	Good (9)
CMCS 201820	*	*	*	*	**	*	*	*	Good (9)
KNHI 20188	*	*	*	*	**	*	*	*	Good (9)
EPOCH-JAPAN 201918	*	—	*	*	**	*	*	*	Good (8)
Jee 201924	*	—	*	*	*	*	*	*	Good (7)
Kim 201919	*	*	*	*	**	*	—	*	Good (8)
Liu 201911	*	*	—	*	*	*	*	*	Good (7)
Zhang, 201912	*	—	*	*	*	*	*	*	Good (7)

^*Total stars awarded.