Random-Effects Model (k = 12; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 191.7325 (SE = 113.0197)
tau (square root of estimated tau^2 value):      13.8468
I^2 (total heterogeneity / total variability):   84.11%
H^2 (total variability / sampling variability):  6.29

Test for Heterogeneity: 
Q(df = 11) = 52.1258, p-val < .0001

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-52.6314   4.7532 -11.0729   <.0001 -61.9475 -43.3153      *** 

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