Rib fracture after stereotactic radiotherapy for primary lung cancer: prevalence, degree of clinical symptoms, and risk factors

Table 4 Results of Cox proportional hazard model analysis

Independent valuable	P value	Hazard ratio	95% confidence interval
Tumor-chest wall distance (mm)	<0.0001	0.858	0.801–0.920
Age	0.713	0.990	0.937–1.045
Gender*	0.002	3.172	1.503–6.695
Maximum diameter of the tumor	0.754	0.994	0.955–1.034
Radiotherapeutic method 48 Gy or not	0.829	0.911	0.391–2.122
Radiotherapeutic method 60 Gy or not	0.087	0.454	0.184–1.121

*The hazard ratio for gender is represented as the hazard of women divided by that of men.

ISSN: 1471-2407