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Table 2 Univariate correlations (Spearman correlation coefficients) between concavity indices, small airway measures, spirometry, age, and smoking history (n = 80)

From: Relationship between concavity of the flow-volume loop and small airway measures in smokers with normal spirometry

Variables

Global concavity%

Peripheral concavity%

rs

P value

rs

P value

Scond

0.10

0.34

0.09

0.39

Sacin

0.08

0.47

0.20

0.07

R5

0.10

0.35

0.27

0.01

X5

0.02

0.84

− 0.09

0.38

FEV1/FVC

− 0.64

 < 0.001

− 0.54

 < 0.001

Age

0.27

0.01

0.58

 < 0.0001

Pack/Year

0.04

0.67

0.38

0.001

  1. There is one missing value for peripheral
  2. R5 resistance, X5 reactance
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BMC Pulmonary Medicine

ISSN: 1471-2466

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