Table 4 Result of the regression analysis

(Intercept)

13.3

6.11 × 10⁵

5.09 × 10⁵–7.33 × 10⁵

< 0.05

Age

5.19 × 10^− 4

1.001

0.998–1.003

0.72

Sex

 Male

(ref.)

−

 Female

−0.0312

0.969

0.879–1.069

0.53

Hospital days

0.0388

1.040

1.031–1.049

< 0.05*

Severity

 Mild

(ref)

−

 Moderate I

0.228

1.26

1.105–1.426

< 0.05*

 Moderate II

0.497

1.64

1.417–1.908

< 0.05*

 Severe

0.611

1.84

1.235–2.739

< 0.05*

ICU stay

0.718

2.05

1.501–2.816

< 0.05*

In-hospital death

0.101

1.11

0.732–1.685

0.63

Interaction between ICU stay and days of ICU stay

0.0190

1.02

0.995–1.044

0.11