Tea consumption didn’t modify the risk of fracture: a dose–response meta-analysis of observational studies

Diagnostic Pathology

Table 2 Quality assessment of included studies ^a

		Quality assessment criteria
Author	Study design	Selection	Comparability	Outcome/exposure	Overall quality
Kreiger N[17]	Case–control	***	**	***	8
Johnell O[18]	Case–control	***	*	**	6
Tavani A[19]	Case–control	***	*	**	7
Chen Z[20]	Cohort	***	*	**	6
Hallström H[21]	Cohort	****	**	***	9
Jha RM[22]	Case–control	**	**	*	5
Kanis J[23]	Case–control	***	**	***	8
Zeng FF[24]	Case–control	***	**	**	7
Tomata Y[25]	Cohort	***	***	**	8

^aThe study quality is evaluated by Downs and Black score and Newcastle-Ottowa Scale (NOS). The NOS were obtained to assess the selection, comparability and exposure of the case–control study, while the selection, comparability and outcome for the cohort study.
*: one point; **: two points; ***: three points.

ISSN: 1746-1596