Fixed-Effects Model (k = 1)

Test for Heterogeneity: 
Q(df = 0) = 0.0000, p-val = 1.0000

Model Results:

estimate       se     zval     pval    ci.lb    ci.ub          
-28.5579   5.8115  -4.9140   <.0001 -39.9483 -17.1676      *** 

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