Basic situation of patients
Basic situation differed between two groups. Male-to-female ratio was 2.22:1 in positive group while 1.12:1 in negative group. Statistical discrepancy existed between 2 groups though χ2test. Median age of positive group was 59 (quartile ranges from 48 to 69), statistical discrepancy existed among 4 age groups. Body weight index (BMI) of positive group was 24.22 kg/m2(quartile ranges from 21.47 to 26.93 kg/m2), statistical discrepancy existed among 4 groups. Statistical discrepancy also existed in patients with complications such as hypertension, liver insufficiency, renal insufficiency, and anemia between 2 groups. Median hospitalization duration of positive group was 17.00 days, which had statistical discrepancy with negative group (7.00 days). Basic information in detail and p value was shown in Table 1.