Table 3. Risk Factors Affecting Pneumothorax After CT-Guided Percutaneous Core Needle Lung Biopsy: Results of Multivariate Analysis.

Variables	P Valuea	ORb [95% CIc]
Greater lesion depth	< 0.001	1.714 [1.496-1.964]
Presence of emphysema	< 0.001	2.954 [1.733-5.037]

Abbreviations: CI, confidence interval; OR, odds ratio.

^aP < 0.05 was significant.

^bThe lowest OR in the group has the lowest risk ratio of 1.0.

^cThe reference group has the lowest risk.