Sex Differences in COVID-19 Outcomes

Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was identified as the cause of an outbreak of severe acute respiratory syndrome in Wuhan City, China in December 2019. Since then, it has caused a worldwide pandemic with over six million deaths. Many studies have been published on coronavirus disease 2019 (COVID-19), but only a few have compared the outcomes of COVID-19 between males and females, especially in African countries and the Middle East. Studies published to date on this topic report that male patients infected with SARS-CoV-2 have worse outcomes than females. This study aimed to compare sex differences in COVID-19 outcomes in a tertiary care hospital in Casablanca (Morocco). Methodology We included all adult patients hospitalized for COVID-19 infection in Cheikh Khalifa Hospital. We categorized patients according to gender and analyzed the characteristics and outcomes of each group. Results In total, 134 patients with polymerase chain reaction (PCR)-confirmed COVID-19 were admitted during the study period. These included 72 (53.7%) men and 62 (46.4%) women. The median age of the patients was 53 years (interquartile range, IQR = 36-64). Men were significantly older than women (58 vs. 44) but there was no significant difference in comorbidities on comparing men and women. Values of median C-reactive protein (35 vs. 4), ferritin (326 vs. 72), and lactate dehydrogenase (264 vs. 208) were significantly higher in men. Lymphopenia was significantly more important in men (1.2 vs. 1.7), and the ratio of neutrophil/lymphocytes was significantly higher in men (3.37 vs. 1.84). Men had greater disease severity, with significantly higher intensive care unit admission (48.6% vs. 16.1%) and higher hospital mortality (18.1% vs. 1.6%). Conclusions COVID-19 gender disparities may be due to sex differences in the inflammatory response. These can be explained by the role of sex hormones and sex chromosomes on immune cells and their regulatory genes.