Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Bivariate Cox regression analysis
| Factor | Hazard ratio (95% CI) | p value |
| PTV/Lung (%)V20 (%) | 2.9 (1.5–5.7)1.0 (0.7–1.3) | 0.002a 0.786 |
| PTV volume (cm3) V20 (%) |
1.0 (1.0–1.0) 1.1 (0.9–1.3) |
0.011a 0.460 |
CI, confidence interval; PTV, planning target volume; V20, The percentage of the total lung volume receiving more than or equal to 20 Gy.
Statistically significant.
