A retrospective study conducted by researchers at a leading hospital here on a group of patients admitted at the facility during the first Covid wave has claimed that females were "relatively at higher risk of mortality" as compared to males having the same co-morbid conditions. The study on 2,586 hospitalized COVID-19 patients has been published on June 25 in Molecular and Cellular Biochemistry, Springer Nature journal, Sir Ganga Ram Hospital said in a statement.