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Meta-analysis of the odds ratio for recurrence of low (1) vs. high WHO grade (2 and 3) spinal meningiomas. CI = confidence interval; RE model = random effects model; Z = test for overall effect; τ2 = between-study variance; x2 = chi-squared test; df = degree of freedom; I2 = percentage of variance in a meta-analysis attributable to study heterogeneity.
