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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.