What this study adds
A rigorous statistical analysis with thorough adjustment for confounding to properly investigate the treatment effect of prior therapeutic anticoagulation on different clinically relevant outcomes in a large cohort of hospitalized COVID-19 patients. Moreover, we are the first to show that prior use of therapeutic anticoagulation is not associated with better outcome parameters in hospitalized COVID-19 patients in terms of all-cause mortality, ICU admittance, need for mechanical ventilation, and length of hospital stay.