Table 3 Univariate Cox regression models for 28- day mortality

Fiber Index[g/(%)] < 3 ref

0.009

 3 ~ 35

0.63 (0.45,0.89)

0.008

 ≥ 35

1.1 (0.84,1.44)

0.502

Sex: Female vs Male

1.01 (0.81,1.27)

0.921

0.921

Age (year)

1.03 (1.02,1.04)

< 0.001

< 0.001

BMI (kg/m²)

0.99 (0.97,1)

0.04

0.034

SOFA

1.07 (1.04,1.1)

< 0.001

< 0.001

SAPSII

1.02 (1.01,1.02)

< 0.001

< 0.001

CCI

1.16 (1.12,1.2)

< 0.001

< 0.001

Number of antibiotics within 72 h

1.0083 (0.9337,1.0889)

0.833

0.834

Vasoactive agents within 72 h: Yes vs. No

1.7 (1.3,2.23)

< 0.001

< 0.001

Average norepinephrine equivalents within 72 h

1.09 (1.04,1.13)

< 0.001

< 0.001

PPI OR H₂RA used within 72 h: Yes vs. No

1.94 (0.86,4.35)

0.108

0.072

Feeding route: PN + EN vs. EN

0.8 (0.51,1.25)

0.324

0.307

Early enteral nutrition: Yes vs. No

0.87 (0.69,1.09)

0.223

0.222

Actual energy intake within 72 h (kcal)

0.9998 (0.9997,0.9999)

0.001

< 0.001