Random-Effects Model (k = 30; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 201.5022 (SE = 86.0210)
tau (square root of estimated tau^2 value):      14.1951
I^2 (total heterogeneity / total variability):   70.66%
H^2 (total variability / sampling variability):  3.41

Test for Heterogeneity: 
Q(df = 29) = 130.1665, p-val < .0001

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-57.5861   3.3991 -16.9415   <.0001 -64.2482 -50.9239      *** 

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