Skip to main content

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