Systematic review of the prevalence and development of osteoporosis or low bone mineral density and its risk factors in patients with inflammatory bowel disease

Table 2 Quality assessment according to the Newcastle–Ottawa Scale

	Schoon et al[13] (2000)	Jahnsen et al[12] (1997)	Jahnsen et al[16] (2004)	Tsai et al[18] (2015)	Targownik et al[3] (2012)	Leslie et al[20] (2009)	Leslie et al[19] (2008)	Andreassen et al[14] (1998)	Andreassen et al[15] (1999)	Bernstein et al[21] (2003, May)	Bernstein et al[22] (2003, November)	Haugeberg et al[17] (2001)
Selection	**	***	**	****	**	**	**	**	***	**	**	***
Comparability		**		**					**			**
Outcome	*	*	**	**	***	**	**	*	*	*	*	*
Total number of stars allocated	3	6	4	7	5	4	4	3	6	3	3	6