Predictive factors for exacerbation and re-exacerbation in chronic obstructive pulmonary disease: an extension of the Cox model to analyze data from the Swiss COPD cohort

Table 3 Best subset models, multivariate Cox-regression

Factors	HR	SE	p
Best exacerbation subset model
FEV₁ %Ref	0.889	0.0414	0.0046
Sputum	1.439	0.1492	0.0150
Best re-exacerbation subset model
Coronary heart disease	1.567	0.226	0.047
Hospitalization for any reason	0.583	0.306	0.078

ISSN: 2049-6958