Table 4– Intraclass correlation coefficients of sputum inflammatory mediators and cell counts in matched stable patients with usual chronic obstructive pulmonary disease (COPD) and α1-antitrypsin deficiency (A1ATD)
A1ATD
–IL-80.818 (0.664–0.935)
–MPO0.931 (0.858–0.977)
–LTB40.634 (0.419–0.852)
–Neutrophil count0.170 (0.101–0.258)
–Macrophage count0.139 (0.088–0.200)
COPD
–IL-80.746 (0.558–0.905)
–MPO0.577 (0.357–0.82)
–LTB40.798 (0.633–0.927)
–Neutrophil count0.365 (0.166–0.674)
–Macrophage count0.654 (0.432–0.871)
  • Data are presented as intraclass correlation (95% confidence intervals). IL: interleukin; MPO: myeloperoxidase; LTB4: leukotriene B4.