Table 3. Results of Conditional Weibull Parametric Regression For Overall Survival: Years 3–6.

Covariate	95% Confidence
	HR	Interval	p-value
Age	1.05	1.03–1.08	<0.001
Nodal Disease	1.03	0.91–1.15	0.670
T Category	0.85	0.52–1.38	0.499
Site	2.27	1.14–4.50	0.019
ECOG	1.21	0.81–1.82	0.357
Treatment
Radiation Alone	1.00
Induction chemotherapy+ RT	0.42	0.17–1.02	0.055
PORT	1.06	0.62–1.83	0.822
POCRT	1.32	0.50–3.50	0.574
Induction+ CRT	0.59	0.20–1.72	0.333
CRT	0.80	0.44–1.47	0.469
Ethnicity
White	1.00
Black	1.73	1.06–2.83	0.028
Other	0.30	0.12–0.74	0.009

N = 401 patients with 25,650 total months at risk.

ECOG PS – European Cooperative Oncology Group performance status.

RT – radiation therapy; PORT – postoperative radiation therapy; POCRT – postoperative chemoradiation therapy; CRT – chemoradiation therapy.

Site –Non-glottic subsite vs. glottic subsite.

Nodal disease N1-N3 vs. N0.