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Table 3 Quality assessment results of included observational trials

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

First author Year Selection Comparability Outcomes  
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
  1. 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