The risk was 5.62 (95% CI 1.72–18.4) for patients with COPD or reduced DLCO% predicted, 3.55 (95% CI 1.32–9.54) for patients with elevated preoperative CRP (>5mg/L) and 5.77 (95% CI 2.13–15.6) for patients with perfusion ≥40% in the operated lung (Table 4 and Table 5). This evidence concerns the gene CRP and chronic obstructive pulmonary disease.