Table 6 Correlations between fraction of exhaled nitric oxide and airway structures

From: Relationship between fraction of exhaled nitric oxide and airway morphology assessed by three-dimensional CT analysis in asthma

 

Spearman rank correlation

Partial rank correlation*

ρ

p-value

ρ

p-value

Ai/BSA

 Third-generation bronchi

0.108

0.507

0.032

0.854

 Fourth-generation bronchi

0.067

0.680

0.027

0.878

 Fifth-generation bronchi

0.144

0.380

0.050

0.779

 Sixth-generation bronchi

0.205

0.209

0.113

0.520

WA/BSA

 Third-generation bronchi

0.326

0.041

0.116

0.508

 Fourth-generation bronchi

0.356

0.025

0.154

0.378

 Fifth-generation bronchi

0.496

0.001

0.272

0.114

 Sixth-generation bronchi

0.529

<0.001

0.360

0.034

  1. Data are expressed as the correlation coefficient (ρ) and p-value. *Partial rank correlations between fraction of exhaled NO and Ai/BSA were adjusted for WA/BSA, age, duration of asthma, dose of inhaled corticosteroid, percentage blood eosinophil, and total blood IgE, and those between fraction of exhaled NO and WA/BSA were adjusted for Ai/BSA and the other five parameters. Ai, airway inner luminal area; WA, wall area; BSA, body surface area.
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