Random-Effects Model (k = 14; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 72.4734 (SE = 68.1138)
tau (square root of estimated tau^2 value):      8.5131
I^2 (total heterogeneity / total variability):   44.26%
H^2 (total variability / sampling variability):  1.79

Test for Heterogeneity: 
Q(df = 13) = 22.4573, p-val = 0.0487

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-35.9292   3.6618  -9.8118   <.0001 -43.1062 -28.7521      *** 

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