Table 3.

Association between clinical features and AECOPD alone

Feature	Univariate analysis OR, 95%CI	Multivariate analysis OR, 95%CI
Subjective increase in sputum purulence	0.70 (0.42 – 1.16)	0.86 (0.47 – 1.56)
Venous pCO2	2.66 (0.74 – 9.62)	1.01 (0.99 – 1.03)
CXR—pleural effusion	0.43 (0.21 – 0.87)	0.53 (0.23 – 1.18)
CXR—pulmonary edema	0.40 (0.15 – 1.08)	0.31 (0.11 – 0.91)
CXR—lobar pneumonia	0.13 (0.07 – 0.25)	0.13 (0.07 – 0.25)