Efficacy and safety of tranexamic acid usage in patients undergoing posterior lumbar fusion: a meta-analysis

Table 3 The Newcastle-Ottawa Scale appraisal scores for the non-RCTs

Study	Selection				Comparability	Outcome
Study	Definition of cases	Cases Representativeness	Selection of Controls	Definition of Controls	Comparability	Assessment of Exposure	Same Methods	Non-Response Rate	Total Score
Endres et al.	*	*	*	*	*	*	*	*	8
Kushioka et al.	*	*	*	*	*	*	*	*	8
Ren et al.	*	*	*	*	**	*	*	*	9

Single asterisk indicates 1 score, double asterisk indicates 2 scores, and dash indicates 0 scores

ISSN: 1471-2474