Table 3.

Critical appraisal using NewCastle-Ottawa Scale for case-control studies.

Study	Selection				Comparability	Exposure			Total
Dupont RM et al. (1990) (12)				*		*	*		3
Swayze VW et al. (1990) (13)				*	*	*	*		4
Figiel GS et al. (1991) (14)				*	*	*	*		4
McDonald WM et al. (1991) (15)				*	*	*	*		4
Strakowski SM et al. (1993) (16)				*	*	*	*		4
Aylward EH et al. (1994) (17)				*		*	*		3
Altshuler LL et al. (1995) (18)		*		*	*	*	*		5
Dupont RM et al. (1995) (19)				*	*	*	*		4
Persaud R et al. (1997) (20)				*	*	*	*		4
McDonald WM et al. (1999) (21)				*	*	*			3
Krabbendam L et al. (2000) (22)				*	*	*	*		4
Moore PB et al. (2001) (23)				*	*	*	*		4
Sassi RB et al. (2003) (24)				*	*	*	*		4
Silverstone T et al. (2003) (25)				*	*	*	*		5
Ahn KH et al. (2004) (26)				*	*	*	*		5
El-Badri SM et al. (2006) (27)				*	*	*	*		4
Gulseren S et al. (2006) (28)				*	*		*		3
Tamashiro et al. (2008) (29)				*	*	*	*		4
Lloyd AJ et al. (2009) (30)				*	*	*	*		4
Macritchie KA et al. (2010) (31)				*	*	*	*		4
Kieseppä T et al. (2014) (32)			*	*	*	*	*		5
Kieseppä T et al. (2022) (33)			*	*	*	*	*		5