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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.
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BMC Medical Research Methodology

ISSN: 1471-2288

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