Random-Effects Model (k = 4; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 132.8308 (SE = 180.4946)
tau (square root of estimated tau^2 value):      11.5252
I^2 (total heterogeneity / total variability):   62.67%
H^2 (total variability / sampling variability):  2.68

Test for Heterogeneity: 
Q(df = 3) = 8.5461, p-val = 0.0360

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-48.0364   7.4489  -6.4488   <.0001 -62.6359 -33.4368      *** 

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