Table 1.

Relationship Between Demographic, Clinical, and Tumor Features and Overall Survival.

Variables	N (%)	Unadjusted HR* (95% CI^)	p value
Sex
Female	258 (37%)	1.0 (ref)	-
Male	439 (63%)	1.244 (0.877–1.764)	0.220
Ethnicity
White	583 (84%)	1.0 (ref)	-
Black	106 (15%)	0.921 (0.584–1.450)	0.722
Others	8 (1%)	#
Age
≤65 years old	135 (19%)	1.0 (ref)	-
66–75 years old	271 (39%)	0.822 (0.485–1.394)	0.467
≥76 years old	291 (42%)	1.726 (1.079–2.760)	0.023
Comorbidity Severity
None	176 (25%)	1.0 (ref)	-
Mild	256 (37%)	1.012 (0.644–1.592)	0.957
Moderate	172 (25%)	1.157 (0.726–1.844)	0.541
Severe	93 (13%)	2.119 (1.305–3.443)	0.002
Tumor Size
<4cm	364 (52%)	1.0 (ref)	-
4–7 cm	166 (24%)	1.696 (1.113–1.585)	<.0001
>7 cm	167 (24%)	2.265 (1.550–3.310)	<0.001
AJCC Pathologic
Stage I	410 (59%)	1.0 (ref)	-
Stage II	199 (29%)	1.575 (1.063–2.335)	0.024
Stage III	73 (10%)	3.070 (1.925–4.895)	<0.001
Stage IV	15 (2%)	11.705 (6.192–22.124)	<0.001
Grade
Low (I,II)	497 (71%)	1.0 (ref)	-
High (III,IV)	200 (29%)	2.065 (1.474–2.893)	<0.001
Histology
MLC	15 (2%)	1.0 (ref)	-
Chromophobe	26 (4%)	2.020 (0.210–19.418)	0.543
Papillary	110(16%)	3.859 (0.522–28.527)	0.186
Clear Cell	504 (72%)	3.750 (0.523–26.875)	0.188
Oncocytoma	22 (3%)	3.331 (0.401–27.681)	0.265
UNCL	10 (1%)	4.143 (0.495–45.787)	0.219
Collecting Duct	10 (1%)	7.735 (0.803–74.485)	0.077

^*Hazard ratio (HR)

^{^}Confidence Interval (CI)

^#No patients died in this ethnicity