Table 1. Distribution of selected variables between the renal cell cancer cases and the control subjects.

Variables	Cases (n = 1488)		Controls (n = 1677)		P -value*
	N	%	N	%
Age (mean ± SD), years	56.7±12.0		57.8±12.0		0.176
<60	893	60.01	975	58.14	0.285
≥60	595	39.99	702	41.86
Sex
Male	942	63.31	1113	66.37	0.072
Female	546	36.69	564	33.63
BMI (mean ± SD), kg/m2	24.1±2.9		23.9±3.1		0.013
<24	730	49.06	902	53.79	0.008
≥24	758	50.94	775	46.21
Smoking status
Never	922	61.96	1115	66.49	0.008
Ever	566	38.04	562	33.51
Drinking status
Never	1092	73.39	1285	76.62	0.036
Ever	396	26.61	392	23.38
Family
No	1380	92.74	1535	91.53	0.208
Yes	108	7.26	142	8.47
Hypertension
No	907	60.95	1259	75.07	<0.001
Yes	581	39.05	418	24.93
Diabetes
No	1295	87.03	1572	93.74	<0.001
Yes	193	12.97	105	6.26
Clinical stage
I	946	0.64
II	303	0.20
III	115	0.08
IV	124	0.08
Grade
I	319	0.21
II	744	0.50
III	322	0.22
IV	103	0.07
Histology
Clear cell	1250	0.84
Papillary	53	0.04
Chromophobe	79	0.05
Unclassified	106	0.07

* Student's t-test for age and BMI distributions between cases and controls; two sided χ² test for other selected variables between cases and controls.