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Table 2 The Relationship Between Circulating Surfactant Protein (SPD) Levelsand Clinical Characteristics

From: Circulating surfactant protein D as a potential lung-specific biomarker of health outcomes in COPD: a pilot study

 

β-coefficient*

R-value

P value

Age (year)

-0.014 ± 0.013

0.23

0.296

Male vs. female

0.138 ± 0.284

0.11

0.633

Body mass index (kg/m2)

-0.005 ± 0.022

0.05

0.822

PaO2 (mmHg)

-0.007 ± 0.015

0.11

0.629

PaCO2 (mmHg)

0.015 ± 0.0146

0.22

0.304

CRQ Score

-0.089 ± 0.136

0.14

0.519

   Dyspnea

-0.225 ± 0.142

0.33

0.128

   Fatigue

-0.022 ± 0.109

0.04

0.844

   Emotion

0.007 ± 0.114

0.01

0.950

   Mastery

-0.110 ± 0.101

0.23

0.288

Six-minute walk test (m)

-0.001 ± 0.001

0.11

0.629

  1. * Regression coefficient ± SE.
  2. Abbreviations : CRQ – Chronic Respiratory Disease Questionnaire, SPD – surfactant protein D.