Table 2.

Correlations of All COPD Subjects (n = 98) Symptom Scores vs. Salivary Biomarker Levels

	Symptom Scores
Salivary Biomarkers	Breathing Score	ADL Score	MRC Score
CRP	r = 0.142, p <0.02	r = 0.105, p <0.08	r = 0.164, p <0.006
PCT	r = 0.125, p <0.04	r = 0.115, p <0.06	r = 0.04, p <0.444
NE	r = 0.105, p <0.082	r = 0.028, p <0.647	r = -0.074, p <0.222

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