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

tau^2 (estimated amount of total heterogeneity): 0 (SE = 120.1461)
tau (square root of estimated tau^2 value):      0
I^2 (total heterogeneity / total variability):   0.00%
H^2 (total variability / sampling variability):  1.00

Test for Heterogeneity: 
Q(df = 1) = 0.0022, p-val = 0.9625

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-20.7036   6.4004  -3.2347   0.0012 -33.2482  -8.1589       ** 

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