Variables with p < 0.05 in the univariate analysis were included in the multivariable logistic regression analysis as the following covariates: rare onset age, vomiting, purpura above the waist, NLR (<3.27 vs. ≥3.27), PLT (<403.5 × 109/L vs. ≥403.5 × 109/L), D-dimer (<3.26 mg/L vs. ≥3.27 mg/L), and serum albumin (≤38.25 g/L vs. >38.25 g/L) (Supplementary Table S1). This evidence concerns the gene ALB and purpura.