Random-Effects Model (k = 16; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 288.0733 (SE = 158.4629)
tau (square root of estimated tau^2 value):      16.9727
I^2 (total heterogeneity / total variability):   72.33%
H^2 (total variability / sampling variability):  3.61

Test for Heterogeneity: 
Q(df = 15) = 108.5614, p-val < .0001

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-42.6288   5.2502  -8.1195   <.0001 -52.9189 -32.3386      *** 

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