Figure 4From: Endothelin-receptor antagonists for aneurysmal subarachnoid hemorrhage: an updated meta-analysis of randomized controlled trialsRisk ratio for angiographic vasospasm. Comparison between endothelin-receptor antagonists (ETRAs) and placebo in patients with aneurysmal subarachnoid hemorrhage. CI, confidence interval; df, degrees of freedom; M-H, Mantel-Haenszel.Back to article page