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Table 2 Quartile values of cytokine measurements on Day 1 and Day 4 of SAB

From: Cytokine measurements add value to clinical variables in predicting outcomes for Staphylococcus aureus bacteremia

Cytokine (pg/ml)

Quartile 1

Quartile 2

Quartile 3

Quartile 4

Overall

p-value

Persistence

Overall

p-value

Mortality

TNF

 Day 1

< 9.54

9.54–18.96

18.97–36.85

> 36.85

< 0.0001

 

 Day 4

< 6.73

6.73–12.57

12.58–24.67

> 24.67

 

< 0.0001

IL-10

 Day 1

< 11.11

11.11–29.96

29.97–118.22

> 118.22

0.002

 

 Day 4

< 5.49

5.49–13.57

13.58–28.93

> 28.93

 

< 0.0001

IL-6

 Day 1

< 25.92

25.92–69.56

69.57–222.65

> 222.65

0.10

 

 Day 4

< 7.02

7.02–19.93

19.94–57.20

> 57.20

 

0.001

IL-8

 Day 1

< 18.00

18.00–48.10

48.11–128.56

> 128.56

0.06

 

 Day 4

< 12.94

12.94–28.05

28.06–68.95

> 68.95

 

< 0.0001

IFNγ

 Day 1

< 4.34

4.34–9.13

9.14–18.69

> 18.69

0.19

 

 Day 4

 < 3.45

3.45–7.00

7.01–13.25

> 13.25

 

0.69

IL-1β

 Day 1

< 1.21

1.21–2.77

2.78–3.25

> 3.25

0.50

 

 Day 4

< 0.83

0.83–1.84

1.85–3.64

> 3.64

 

0.87

IL-17

 Day 1

< 1.92

1.92–5.07

5.08–11.22

> 11.22

0.17

 

 Day 4

< 1.88

1.88–3.75

3.76–9.88

> 9.88

 

0.23

  1. All cytokine concentrations (IFNγ, IL-1β, IL-6, IL-8, IL-10, IL-17, TNF) were measured in duplicates using Luminex multiplex assay (Millipore, Billerica, MA) per manufacturer’s instructions. Chi-square (or Fisher’s exact) tests were performed on Day 1 cytokine measurements for persistence and Day 4 measurements for mortality, respectively