Table 2.
Odds ratio and comparison of risk factors between the two groups
| Risk Factor | Pneumothorax | Odds ratio | 95% Confidence Interval | ||
| No | Yes | ||||
| Bullae | No | 10 | 1 | 15 | 1.3–168 |
| Yes | 4 | 6 | |||
| Emphysema | No | 9 | 1 | 10.8 | .997–117 |
| Yes | 5 | 6 | |||
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