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The World Health Organisation recently declared the outbreak of severe acute respiratory syndrome Coronavirus 2 disease (COVID-19) a global pandemic [1]. It is known that people with diabetes have a higher overall risk of infection resulting from multiple perturbations of innate immunity [2]. Presently, it remains uncertain whether people with diabetes are also at higher risk of infection and, especially, at greater severity of illness associated with COVID-19. A recent meta-analysis of 30 observational studies (most of which were preprint studies that have yet to be reviewed) showed that pre-existing diabetes is significantly associated with poorer in-hospital clinical outcomes [3], but none of the included studies have examined whether the impact of diabetes on COVID-19 severity is independent of age, sex and metabolic comorbidities, such as obesity and hypertension. Therefore, in this retrospective study, we aimed …