
Random-Effects Model (k = 58; tau^2 estimator: REML)

tau^2 (estimated amount of total heterogeneity): 0.4294 (SE = 0.1448)
tau (square root of estimated tau^2 value):      0.6553
I^2 (total heterogeneity / total variability):   57.34%
H^2 (total variability / sampling variability):  2.34

Test for Heterogeneity: 
Q(df = 57) = 131.9534, p-val < .0001

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
 -1.7779   0.1166 -15.2433   <.0001  -2.0064  -1.5493      *** 

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

