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Table 1 Cochrane Items Closely Related to the Levels of Evidence

From: Does a "Level I Evidence" rating imply high quality of reporting in orthopaedic randomised controlled trials?

Levels of Evidence JBJS in instruction for Authors Cochrane Item
Level Description A B C D E F G H I J K L
I High-quality randomised controlled trial with statistically significant difference or no statistically significant difference but narrow confidence intervals 2 X 2 x 2 2 x x x x x 2
II Lesser-quality randomised controlled trial (e.g., <80% follow-up, no blinding, or improper randomisation) 0 X 0 x 0 0 x x x x x 0
  1. Levels of Evidence compared with separate Cochrane items. 2 is maximal possible Cochrane score. 0 is minimal possible score. X is not described in instruction for authors.