Skip to main content

Table 6 Primary study types incorporated within included reviews

From: Systematic review of methods used in meta-analyses where a primary outcome is an adverse or unintended event

Study types

No. included reviews

% included reviews1

Randomised trials

70

42.2

Other trials2

7

4.2

Observational studies

56

33.7

Mixed (trials and

  

observational studies)

26

15.7

Not stated

7

4.2

  1. 1Out of 166 included reviews.
  2. 2May include randomised trials but not specifically stated as such.
Back to article page

BMC Medical Research Methodology

ISSN: 1471-2288

Contact us