Table 4.

Risk factors for mortality in multivariate survival analysis

	HR	95% CI	P
Sex
Male (Ref)	1.00
Female	0.92	0.84–1.02	0.110
Age (years)
18–44 (Ref)	1.00
45–64	1.22	0.99–1.50	0.066
65–79	1.43	1.14–1.80	0.002
≥80	1.80	1.38–2.34	<0.001
Race
White (Ref)	1.00
Black	1.06	0.95–1.19	0.315
Hispanic	0.89	0.73–1.08	0.230
Asian	0.86	0.66–1.11	0.235
Other	0.66	0.38–1.16	0.147
Insurance
Private (Ref)	1.00
Uninsured/medicaid	1.27	1.13–1.42	<0.001
Medicare/other govt	1.21	1.07–1.38	0.004
Income
≥$30,000/year (Ref)	1.00
<$30,000/year	1.01	0.89–1.14	0.930
Education
>71% with HSD (Ref)	1.00
≤71% with HSD	0.99	0.88–1.12	0.903
Proximity to metro area
In metro area (Ref)	1.00
Adjacent to metro area	0.97	0.85–1.10	0.586
Not adjacent to metro area	1.21	0.99–1.47	0.060
Facility location
Northeast (Ref)	1.00
Midwest	1.11	0.98–1.26	0.118
South	1.00	0.90–1.13	0.906
West	0.95	0.82–1.11	0.525
Facility type
ARP (Ref)	1.00
Non‐ARP	1.17	1.07–1.27	0.001
Charlson score
0 (Ref)	1.00
1	1.33	1.19–1.48	<0.001
≥2	1.57	1.30–1.89	<0.001
Primary site
Oral cavity (Ref)	1.00
Oropharynx	0.80	0.71–0.91	0.001
Nasopharynx	0.85	0.71–1.02	0.074
Hypopharynx	1.00	0.85–1.17	0.987
Glottic larynx	0.85	0.73–1.00	0.056
Supraglottic larynx	0.81	0.70–0.94	0.005
Treatment
Systemic only (Ref)	1.00
LR only	0.89	0.77–1.02	0.087
Systemic + LR	0.73	0.65–0.83	<0.001
None	2.03	1.78–2.31	<0.001
Clinical trial
No (Ref)	1.00
Yes	1.89	1.11–3.22	0.019
Palliative care
No (Ref)	1.00
Yes	1.54	1.37–1.73	<0.001

HR, hazard ratio; CI, confidence interval; Ref, referent category; HSD, high school diploma; ARP, academic/research program; LR, locoregional.