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Table 3 Best subset models, multivariate Cox-regression

From: 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

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