Table 2.

Cox Proportional Hazard Models of Total Vitamin D Intake Quartiles

	Total Vitamin D Intake(IU/day)				p-value for trend
	<200	[200–465)	[465, 675)	>=675
HNC-specific Death
# Deaths	18	12	15	21
17,592.14 p-mos	4277.45	4623.77	4533.09	4157.83
HR (95% CI) †	1.0(ref)	0.60(0.29, 1.25)	0.73(0.37, 1.46)	1.01(0.54, 1.90)	.814
HR (95% CI) ‡	1.0(ref)	0.55(0.25, 1.20)	0.65(0.32, 1.35)	0.79(0.40, 1.56)	.707
Overall Death
# Deaths	27	24	25	32
17,592.14 p-mos	4277.45	4623.77	4533.09	4157.83
HR (95% CI) †	1.0(ref)	0.82(0.47, 1.42)	0.82(0.47, 1.41)	1.00(0.60, 1.67)	.967
HR (95% CI) ‡	1.0(ref)	0.71(0.39, 1.27)	0.73(0.41, 1.29)	0.84(0.48, 1.47)	.656
Recurrence
# Recurring	14	19	16	10
13,115.27 p-mos	3049.76	3509.75	3443.55	3112.21
HR (95% CI) †	1.0(ref)	1.16(0.58, 2.32)	0.94(0.46, 1.93)	0.57(0.25, 1.28)	.139
HR (95% CI) ‡	1.0(ref)	1.19(0.57, 2.49)	0.90(0.42, 1.92)	0.47(0.20, 1.10)	.048

^†age-adjusted

^‡adjusted for age, smoking status, alcohol status, hpv status, highest education level, ACE score, total calorie intake, disease site, and stage.

N=434, Recurrence analysis N=389