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Table 3 Subgroup analyses of the reproducibility of the absolute value of FeNO in the birth cohort participants.

From: Are exhaled nitric oxide measurements using the portable NIOX MINO repeatable?

 

Mean intra-participant difference in FeNO (ppb) (95% CI) [p-value] *

Standard deviation (SD) of the intra-participant difference in FeNO (ppb)

95% limits of agreement (ppb)

All participants

1.37

4.58

-7.61 to 10.34

(n = 494)

(0.96, 1.77) [<0.001]

  

Males

1.43

4.97

-8.30 to 11.17

(n = 251)

(0.82, 2.05) [<0.001]

  

Females

1.30

4.15

-6.83 to 9.43

(n = 243)

(0.77, 1.82) [<0.001]

  

Participants with a low FEV 1

2.01

5.21

-8.20 to 12.22

(n = 162)

(1.20, 2.81) [<0.001]

  

Participants with a high FEV 1

1.07

3.75

-6.28 to 8.42

(n = 162)

(0.49, 1.65) [<0.001]

  

Participants with asthma

2.37

7.01

-11.38 to 16.12

(n = 71)

(0.71, 4.03) [0.006]

  

All others participants

1.19

4.09

-6.82 to 9.20

(n = 401)

(0.79, 1.59) [<0.001]

  
  1. A low FEV1 implies an FEV1in the lowest tercile for the birth cohort participants (less than 98.94% predicted), whilst a high FEV1 implies an FEV1in the highest tercile for all the birth cohort participants (greater than 109.80% predicted).
  2. 95% limits of agreement = Mean intra-participant difference in FeNO ± 1.96 (SD)
  3. * For comparison of the mean intra-participant difference in FeNO in each group against zero (one sample t-test).
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Respiratory Research

ISSN: 1465-993X

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