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Table 1 Components of the 132 systematic reviews that included a meta-analysis.

From: Can we rely on the best trial? A comparison of individual trials and systematic reviews

 

Mean (SD)

Median

Range

Comments

Trials in the meta analysis

7.3 (11.6)

4.0

2 to 184

Does not include the 35 reviews with a single trial

Weight of the most precise trial

50% (22.0)+-

51%

3.3 to 96.4

Weight is based on the inverse variance calculated in RevMan

Sample size in most precise trial

1148 (7392)

183

14 to 82,892

 

P value for meta analysis

0.21 (0.29)

0.03

0.0 to 0.99

 

Degree of Heterogeneity - I2

26.6% (30%)

1.2%

0% to 90%

Does not include the 35 reviews with a single trial