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Table 2 Results of statistical analysis on repeatability

From: Comparative analysis of selected exhaled breath biomarkers obtained with two different temperature-controlled devices

EcoScreen

      
 

Volume

pH

LTB4

NOx

8-iso PGF

PGE2

bias %

3.5

0.2

+)

48.9

2.1

+)

CV %

7.7

0.9

 

166.3

21.4

 

r2

0.479

0.889

 

n.c.

0.816

 

p

0.027

< 0.0001

 

n.c.

0.002

 

ICC

0.692

0.943

 

n.c.

0.903

 

ECoScreen2

      
 

Volume

pH

LTB 4

NOx

8-iso PGF

PGE 2

bias %

0.5

0.7

9.0

+)

3.2

11.9

CV %

8.0

1.0

18.6

 

11.5

34.4

r2

0.618

0.915

0.656

 

0.626

0.704

p

0.021

0.0002

0.015

 

0.017

0.018

ICC

0.786

0.957

0.810

 

0.791

0.839

  1. Repeated measurements of volume, pH and the mediators in EBC obtained with either the ECoScreen or ECoScreen2 device within 30 minutes. Values of the mean differences of sampling period 1 and 2 (bias), CVs and correlations. CV, coefficient of variation; ICC, intraclass correlation coefficient; n.c., not calculated. +)mediator concentration < LOQ.