Significant association between vitamin D deficiency and sepsis: a systematic review and meta-analysis

BMC Anesthesiology

Table 2 Quality assessment for cross-sectional study

Study (Year)	Selection						Comparability		Outcome			Total
	Representativeness of the sample		Justified sample size	Ascertainment of exposure		Comparable non-respondents rate between two groups	Comparability of different samples on the basis of the design or analysis		Assessment of outcome		Appropriate statistical test
	truly representative	somewhat representative	Justified sample size	Validated measurement tool	Non-validated tool	Comparable non-respondents rate between two groups	study controls for important factor	study controls for any additional factor	independent blind assessment	record linkage	Appropriate statistical test
Jeng 2009				**			*	*	**		*	7
Muller 2000		*		**					**		*	6
Su 2013		*		**					**		*	6

ISSN: 1471-2253