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Table 2 Quality assessment of the included cohort studiesa

From: Comparison of platelet reactivity between prasugrel and ticagrelor in patients with acute coronary syndrome: a meta-analysis

Cohort Representativeness of the exposed cohort Selection of the unexposed cohort Ascertainment of exposure Outcome of interest not present at start of study Control for important factor or additional factorb Outcome assessment Follow-up long enough for outcomes to occur Adequacy of follow-up of cohortsc Total quality scores
Alexopoulos 2014 [8] 8
Dillinger 2014 [13] 8
Kerneis 2015 [15] 7
Yudi 2016 [21] 5
  1. a A study could be awarded a maximum of one star for each item except for the item Control for important factor or additional factor
  2. b A maximum of 2 stars could be awarded for this item. Studies that controlled for cardiovascular disease received one star, whereas studies that controlled for other important confounders such cancer received an additional star
  3. c A cohort study with a follow-up rate > 75% was assigned one star