Figure 3.

Influence of (A) randomization to experimental group and (B) blinding of outcome assessment on the estimate of efficacy of endothelin receptor antagonists for reduction of arterial vasospasm. The shaded gray bar represents the 95% confidence limits of the global estimate. The vertical error bars represent the 95% confidence intervals (CIs) for the individual estimates. The width of each vertical bar reflects the log of the number of animals contributing to that comparison. None of the differences were statistically significant (P>0.05).