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Table 4 Measure of effect

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

Measure of effect

No. included reviews

Percent included reviews1

Comparative measures (between interventions)

Odds ratio

55

33.1

Relative risk

51

30.7

Risk difference

8

4.8

Mean difference

6

3.6

Standardised mean difference

7

4.2

Percent difference

2

1.2

Non-comparative measures

Correlation

2

1.2

Probability (or percent)

13

7.8

Mean difference

2

1.2

Percent difference

3

1.8

Multiple measures

More than one

16

9.6

Other measures

Other

1

0.6

  1. 1Out of 166 included reviews.