Comparison between oblique lumbar interbody fusion and posterior lumbar interbody fusion for the treatment of lumbar degenerative diseases: a systematic review and meta-analysis

Table 1 Quality assessment of the included studies

Reference	Selection				Exposure
Reference	Is the case definition adequate?	Representativeness of the cases	Selection of controls	Definition of controls	Comparability of cases and controls based on the design or analysis	Ascertainment of exposure	Same method of ascertainment for cases and controls	Nonresponse rate	Total scores (of 9)
Cen et al. [24]	*	*		*	**	*	*		7
Li et al. [11]	*	*		*	**	*	*	*	8
Chen et al. [25]	*	*		*	**	*	*	*	8
Cho et al. [12]	*	*		*	**	*	*	*	8
Du et al. [27]	*	*		*	**	*	*	*	8
Kang et al. [28]	*	*		*	**	*	*	*	8
Li et al. [23]	*	*		*	**	*	*	*	8
Zhao et al. [26]	*	*		*	**	*	*	*	8

NOS uses the semiquantitative principle of star system to evaluate the quality of literature, with a full score of 9 stars

ISSN: 1749-799X