Random-Effects Model (k = 11; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 18.5340 (SE = 41.3420)
tau (square root of estimated tau^2 value):      4.3051
I^2 (total heterogeneity / total variability):   18.88%
H^2 (total variability / sampling variability):  1.23

Test for Heterogeneity: 
Q(df = 10) = 11.3667, p-val = 0.3297

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-59.0516   3.0431 -19.4050   <.0001 -65.0160 -53.0872      *** 

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