Meta-analysis and systematic review of intravascular ultrasound versus angiography-guided drug eluting stent implantation in left main coronary disease in 4592 patients

Table 3 Quality assessment results of included observational trials

First author	Year	Selection				Comparability	Outcomes
First author	Year	Representativeness of the exposed cohort	Selection of the unexposed cohort	Ascertainment of exposure	No interest outcomes at start of the study	Comparability of cohorts on the basis of design and analysis	Assessment of outcomes	Was follow-up sufficient for the outcome	Adequacy of follow-up	NOS score
Agostoni et al. [21]	2005	*	*	*	*			*	*	6
Park et al. [22]	2009	*	*	*	*	**		*	*	8
De La Torre Hernandez et al. [23]	2014	*	*	*	*	**	*	*		8
Gao et al. [24]	2014	*	*	*	*	**	*	*		6
Kim et al. [26]	2017	*	*	*	*		*	*		6
Tian et al. [16]	2017	*	*	*	*	*	*	*	*	8

Footnote: Each asterisk represents one star in the Newcastle-Ottawa Scale system. The maximum number of stars is 2 for comparability and 1 for each of the other categories, for a total of up to 9 stars. NOS Newcastle-Ottawa scale

ISSN: 1471-2261