Table 3 Selected top 5 features based on GBDT in the third stage

1

Arthralgia

1.5255

2

Ferritin × lymphocyte count

1.2290

3

White blood cell count

1.1873

4

Ferritin × platelet count

1.0806

5

α1-acid glycoprotein/creatine kinase

0.7984

6

Ferritin × ESR

0.7849

7

Ferritin/urea

0.7571

8

Sore throat

0.5257

9

Ferritin

0.3128

10

Monocyte percentage

0.2719