Table 3.

A Multivariate Cox Analysis of the Likelihood of Death at Any Given Time for Demographic and Surgical Variables for the Axial Cohort

Likelihood of Death at Any Given Time	IRRa	95% Confidence Interval			P
Age category
<23	Ref	Ref		Ref	Ref
23-45	1.325	1.137	—	1.545	<0.001
46-62	2.107	1.734	—	2.561	<0.001
62+	3.528	2.695	—	4.619	<0.001
Sex
Men	Ref	Ref		Ref	Ref
Women	0.798	0.707	—	0.9	<0.001
Metastasis at time of diagnosis
Yes	3.958	3.478	—	4.505	<0.001
Year of diagnosis
2004-2007	Ref	Ref		Ref	Ref
2008-2011	1.102	0.966	—	1.258	0.149
2012-2015	0.965	0.815	—	1.142	0.677
Treatment choice
None	Ref	Ref		Ref	Ref
Surgery	0.305	0.227	—	0.411	<0.001
Radiation	16.575	2.263	—	121.416	0.006
Chemotherapy	0.919	0.707	—	1.193	0.525
Surgery and radiation	0.599	0.309	—	1.165	0.131
Surgery and chemotherapy	0.476	0.375	—	0.605	<0.001
Radiation and chemotherapy	5.62	0.767	—	41.161	0.089
Unknown	0.363	0.217	—	0.606	<0.001

IRR = Incidence Rate Ratio

^aDefined as the incidence rate of the exposed population divided by the total number of people at risk of death at any one point in time.

Significance set at <0.05.