Table 4.

Correlation of All COPD Subject (n = 98) Symptom Scores vs. Sputum Metrics

	Symptom Scores
Sputum Metrics	Breathing Score	ADL Score	MRC Score
Amount	r = 0.34, p < 0.001	r = 0.34, p < 0.001	r = 0.24, p < 0.001
Texture	r = 0.07, p < 0.24	r = 0.24, p < 0.001	r = 0.31, p < 0.001
Colour	r = 0.26, p < 0.001	r = 0.19, p < 0.001	r = 0.28, p < 0.001

COPD = Chronic Obstructive Pulmonary Disease; FEV₁ = Forced Expiratory Volume in 1 s; MRC = Medical Research Council; ADL = Activity of Daily Living; CRP = C-Reactive Protein; PCT = Procalcitonin; NE = Neutrophil Elastase. Data are presented as the Spearman’s correlation coefficient: r value