38 39 On the other hand, the subgroup analysis is based on a comparison between trials; it is not robust across statistical analyses (the effect did not appear in the univariable analysis but only in the meta-regression, and the meta-regression is at high risk of over-fitting—six trials account for 92.5% of the weight), and was not prespecified; the apparent reduction in mortality with GLP-1 is both small and of borderline significance.
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Incretin based treatments and mortality in patients with type 2 diabetes: systematic review and meta-analysis.
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