Random-Effects Model (k = 22; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 136.1260 (SE = 59.9634)
tau (square root of estimated tau^2 value):      11.6673
I^2 (total heterogeneity / total variability):   75.94%
H^2 (total variability / sampling variability):  4.16

Test for Heterogeneity: 
Q(df = 21) = 79.1351, p-val < .0001

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-66.0629   3.0103 -21.9454   <.0001 -71.9630 -60.1627      *** 

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