Among the enrolled cases, the overall mean age was 43.12 years (SD 19.02). 84 patients (30.00%) were aged 50-64 years, which accounted for the highest proportion. The proportion of patients aged under 18 years, 18-24 years and 25-49 years were 12.50%, 5.00% and 27.86%, respectively. Moreover, 49 patients (17.50%) were mild type, 148 patients (52.86%) were moderate type, 75 patients (26.79%) were severe type and 8 patients (2.85%) were critically ill.