Table 2.

Associations between Sputum AcPGP and clinical features of COPD

	Model 1			Model 2#
	Beta	S.E.	P-value	Beta	S.E.	P-value
FEV1, percent predicted	−2.58	1.38	0.063	n/a	n/a	n/a
FEV1/FVC	−0.02	0.007	0.018	n/a	n/a	n/a
FEF25–75, percent predicted	−2.40	1.20	0.046	n/a	n/a	n/a
GOLD Stage	0.14	0.05	0.004	n/a	n/a	n/a
CAT	0.93	0.52	0.073	0.55	0.49	0.27
PRM-emph	1.72	0.70	0.015	1.26	0.63	0.040
PRM-fSAD	1.67	0.81	0.040	1.08	0.70	0.127

Model 1 = Linear regression models included sputum AcPGP, age, sex, current smoking status. ^#Model 2 = Linear regression model was adjusted for FEV₁ percent predicted in addition to previously listed covariates (model 2 was not used for spirometric based outcome variables)