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Table 2 Variables associating with individual GDF15 concentrations in multivariable linear regression analysis

From: The clinical potential of GDF15 as a “ready-to-feed indicator” for critically ill adults

Model with variables explaining serum GDF15 concentrations upon ICU admission

Scaled estimate (95%CI)

p value

ICU-independent variables

 Age

353 (− 528; 1234)

0.43

 BMI

− 674 (− 2057; 709)

0.33

 History of diabetes mellitus

731 (314; 1147)

0.0006

 History of malignancy

485 (60; 909)

0.02

 NRS score of ≥ 5 vs < 5

424 (− 24; 872)

0.06

ICU-related variables

 Admission diagnosis

  Cardiac surgery

16 (− 761; 793)

0.96

  Elective other surgery

1566 (445; 2687)

0.006

  Emergency other surgery

− 1256 (− 2013; − 499)

0.001

  Medical disease

− 326 (− 1477; 824)

0.57

 APACHE-II score

4454 (3211; 5697)

< 0.0001

 Sepsis upon admission

2232 (594; 3869)

0.007

 Infection upon admission

− 1412 (− 3059; 234)

0.09

 Mechanical ventilation on ICU day 1

296 (− 452; 1044)

0.43

 Steroids on ICU day 1

703 (212; 1194)

0.005

Laboratory parameters

 Blood glucose upon ICU admission

− 1975 (− 4405; 455)

0.11

 Plasma creatinine on ICU day 1

22,102 (19,679; 24,526)

< 0.0001

 Plasma total bilirubin on ICU day 1

13,569 (10,097; 17,041)

< 0.0001

 Plasma CRP on ICU day 1

− 1605 (− 3132; − 78)

0.03

  1. Scaled estimates are shown for all variables included in the linear regression model built to explain individual GDF15 concentrations upon ICU admission. Age, BMI, APACHE-II score, and the laboratory parameters were added as continuous variables; all other variables were added as categorical variables. The R2 of the model was 0.23. A sensitivity analysis using BMI (< 18.5 kg/m2, 18.5–25 kg/m2, > 25 kg/m2) and age (18– < 30 years, 30– < 50 years, 50– < 70 years, 70– < 90 years, > 90 years) as categorical variables was performed to rule out non-significant associations in case of non-linear relationships, which also yielded insignificant associations for all categories (data not shown)
  2. Abbreviations: GDF15 growth-differentiation factor-15, ICU intensive care unit, BMI body mass index, NRS nutritional risk screening, APACHE acute physiology and chronic health evaluation, CRP C-reactive protein