Table 3 Estimation of the death risk ratio based on different models of scores of APACHE IV and SOFA tools in patients admitted to the ICU using the Cox regression

APACHE IV

Model 1

Quantitative score

1.042 (1.029–1.055)

 > 0.001

1.058 (1.043–1.073)

 > 0.001

1.047 (1.038–1.057)

 > 0.001

Model 2 mean

 > 49

Reference

Reference

Reference

 ≥ 49

4.821 (2.022–11.492)

 > 0.001

10.54 (92.548–44.046)

 > 0.001

6.214 (2.989–12.918)

 > 0.001

Model 3 one third

 > 40

Reference

Reference

Reference

40–61

1.443 (0.360–5.784)

0.605

0.638 (0.090–4.540)

0.654

1.068 (0.349–3.269)

0.908

 ≥ 61

9.100 (2.792–29.663)

 > 0.001

9.500 (2.278–39.61)

 > 0.002

9.281 (3.742–23.016)

 > 0.001

SOFA

Model 1

Quantitative score

1.476 (1.343–1.623)

 > 0.001

1.252 (1.157–1.355)

 > 0.001

1.342 (1.266–1.422)

 > 0.001

Model 2 mean

 > 3

Reference

Reference

Reference

 ≥ 3

9.055 (2.192–37.410)

 > 0.002

3.071 (1.085–8.691)

0.035

5.151 (2.245–11.822)

 > 0.001

Model 3 one third

 > 2

#

Reference

Reference

2–4

Reference

0.471 (0.112–1.982)

0.305

0.555 (0.150–2.054)

0.378

 > 4

15.022 (5.382–41.928)

 > 0.001

3.689 (1.124–12.10)

0.031

6.191 (1.948–19.674)

 > 0.002