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. 2015 Nov;7(11):1978–1985. doi: 10.3978/j.issn.2072-1439.2015.11.23

Table 5. Multivariate analysis of predictors of freedom from recurrent pneumothorax (Cox regression).

Variables HR (95% CI) P value
Age (≤30 vs. >30 years) 0.345 (0.078-1.533) 0.162
Smoking (yes vs. no) 0.423 (0.169-1.062) 0.067
Group (A vs. B) 0.212 (0.082-0.547) 0.001