Fig. 1
From: Symptom profiles and inflammatory markers in moderate to severe COPD
Pattern of COPD symptom classes based on normalized symptom scores. *Z-scores on Y-axis; higher z-scores indicate worse symptoms. Class 1 (diamond): Low physical and low psychological symptom burden (Low-Phys/Low-Psych); 26%. Class 2 (square): Low physical and moderate psychological symptom burden (Low-Phys/Mod-Psych); 18%. Class 3 (triangle): High physical and moderate psychological symptom burden (High-Phys/Mod-Psych); 25%. Class 4 (circle): High physical and high psychological symptom burden (High-Phys/High-Psych); 30%