Validation results
The basic characteristics of included patients at admission are shown inTable 3 . A total of 148 patients were included in this study. Severe cases accounted for 19.6%. The most common symptoms at admission were fever (81.76%) and cough (61.49%). The less common symptoms were muscle pain (20.27%), fatigue (17.57%) and sore throat (17.57%). The respiratory rate was accelerated on admission in severe patients compared with that in non-severe patients. The proportion of fever in the severe group (96.55%) was higher than that in the non-severe group (78.15%) (p=0.021), but the incidence of gastrointestinal symptoms such as diarrhea and abdominal pain was lower.