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Table 1 Baseline characteristics of the study participants

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

  Mean ± SD
Number 23
Age (year) 64.8 ± 10.6
Men (%) 11 (47.8%)
Body mass index (kg/m2) 27.7 ± 6.6
FEV1 (L) 0.84 ± 0.32
FEV1 (% predicted) 30.8 ± 14.8
PaO2 (mmHg) 58.6 ± 10.0
PaCO2 (mmHg) 44.5 ± 9.8
CRQ score 4.1 ± 1.1
   Dyspnea 3.0 ± 1.0
   Fatigue 3.5 ± 1.3
   Emotion 4.9 ± 1.3
   Mastery 4.5 ± 1.4
Six-minute walk test (m) 286.0 ± 123.6
SPD (ng/mL)* 74.7 (49.2–128.7)
CC16 (μg/L)* 4.6 (3.8–8.7)
CRP (mg/L)* 3.5 (1.1–9.8)
  1. * Median and interquartile range.
  2. Abbreviations: CC16 – Clara cell protein, CRP – C-reactive protein, SPD – Lung surfactant protein D, FEV1 – forced expiratory volume in one second.