Figure 4

Pearson correlations between MMSE scores and relevant factors in COPD groups. ▼ = serum S100B concentrations; ▲ = PaO₂; ■ = FEV₁% predicted. A = mild-to-moderate COPD group: S100B (r = −0.40, P < 0.01); B = severe COPD group: S100B (r = −0.31, P < 0.01); C = mild-to-moderate COPD group: PaO₂ (r = 0.59, P < 0.01); D = severe COPD group: PaO₂ (r = 0.46, P < 0.01); FEV₁ (r = 0.35, P < 0.05).