Table 3 Risk score and risk categories

Lymphocytes at admission

 ≥ 600 cells/µl

0 point

 400–600 cells/µl

1 point

 ≤ 400 cells/µl

2 points

Respiratory rate

 ≤ 20 brpm

0 point

 21–28 brpm

1 point

 > 28 brpm

2 points

LDH at admission

 ≤ 280 U/l

0 point

 280–400 U/l

1 point

 > 400 U/l

2 points

Radiological alteration

 No

0 point

 Yes

1 point

A: 0 point

0.0% (0.0–0.0%)

B: 1–2 points

3.5% (1.0–6.6%)

C: 3–4 points

10.0% (5.0–15.8%)

D: 5 or more points

45.2% (29.0–61.3%)