Random-Effects Model (k = 8; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 104.5563 (SE = 152.3027)
tau (square root of estimated tau^2 value):      10.2253
I^2 (total heterogeneity / total variability):   36.94%
H^2 (total variability / sampling variability):  1.59

Test for Heterogeneity: 
Q(df = 7) = 10.7310, p-val = 0.1508

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-51.8103   6.2026  -8.3530   <.0001 -63.9672 -39.6534      *** 

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Signif. codes:  0 *** 0.001 ** 0.01 * 0.05 . 0.1   1 