PMCH and COVID-19: The performance of these 11 features, namely LDL (No 43), cholesterol (No 39), HDL-C (No 36), MCHC (No 20), triglyceride (No 48), amylase (No 31), UA (No 51), LDH (No 42), CK-MB (No 32), ALP (No 30) and MCH (No 19) and their various combinations in the diagnosis of the disease was higher than the individual performances, suggesting that there is a high level of confidential information between these feature combinations and COVID-19.