Association between type 2 diabetes (T2D) and tooth loss: a systematic review and meta-analysis

BMC Endocrine Disorders

Table 4 Quality assessment using Newcastle-Ottawa Scale for case control studies^a

Study	Selection				Comparability		Exposure			Study score
Study	case definition adequate	Representativeness of the cases	Selection of Controls	Definition of Controls	study controls for important factors	study controls for other factors	Assessment of exposure	Same method of ascertainment for cases and controls	Non-Response rate	Study score
Costa FO, et al., 2013 [37]	*		*		*	*	*	*		6/9
Frias-Bulhosa, et al. 2018 [28]	*			*			*	*		4/9
Shamala, et al. 2017 [27]	*						*	*		3/9

^aStudy score less than 4 indicates low quality, a score of 4 to 6 represents poor to moderate, and a score 7 or higher indicates as a good quality

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