Table 3.
Adjusted Hazard ratio after 1st episode of pneumothorax according to age categories. Gender and treatment groups were contained in Gray’s test for calculating hazard ratio.
| Variables | Age categories | Total | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| < 14 | ≥ 14, < 20 | ≥ 20 | |||||||||
| HR (95% CI) | p-value | HR (95% CI) | p-value | HR (95% CI) | p-value | HR (95% CI) | p-value | ||||
| Age | |||||||||||
| < 14 | 1.5 (1.41–1-60) | < 0.001 | |||||||||
| ≥ 14, < 20 | 2.61(2.55–2.68) | < 0.001 | |||||||||
| ≥ 20 | Ref | ||||||||||
| Gender | |||||||||||
| Male | Ref | Ref | Ref | Ref | |||||||
| Female | 0.44 (0.37–0.53) | < 0.001 | 0.58 (0.525–0.61) | < 0.001 | 0.73 (0.68–0.77) | < 0.001 | 0.63 (0.61–0.66) | < 0.001 | |||
| Treatment | |||||||||||
| Group I (conservative) | Ref | Ref | Ref | Ref | |||||||
| Group II (surgery) | 6.03 (5.29–6.86) | < 0.001 | 1.16 (1.13–1.19) | < 0.001 | 1.07 (1.02–1.12) | < 0.001 | 1.18 (1.15–1.21) | < 0.001 | |||
HR Hazard ratio, CI confidential interval.