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> Il numero medio di patologie osservate in questa popolazione è di 2.7 (mediana 2, Deviazione Standard 1.6)

It seems the above poses another question; is diabetes just confounding other underlying condition(s)?

Further, if most of the patients suffered from type 2 diabetes, it would likely correlate with older age in which case higher fatality rates are to be expected.

I was unable to find this info publicly available, but diabetes being one of the "2+ underlying conditions" seems probable.