Table 1.

Baseline descriptive characteristics of 55947 patients with localized renal cell carcinoma (T_1–2N₀M₀) treated by nephrectomy or nephron sparing surgery.

Variable	Whole cohort			T1a Stage			T1b Stage			T2 Stage
	NE	NSS	P	NE	NSS	P	NE	NSS	P	NE	NSS	P
Number of patients	33292	22655		13309	18623		12705	3513		7278	519
Age (continuous)	60.1 (12.6)	58.6 (12.7)	<0.01	60.1 (12.6)	58.4 (12.8)	<0.01	60.7 (12.5)	59.6 (12.6)	<0.01	58.9 (12.5)	59.1 (13.0)	0.81
Gender
Female	13161	8613	<0.01	5572	7255	<0.01	4970	1186	<0.01	2619	172	0.192
Male	20131	14042		7737	11368		7735	2327		4659	347
Race
Black	4091	2584	0.010	1765	2018	<0.01	1416	476	<0.01	910	90	0.005
White	27026	18492		10727	15303		10421	2797		5878	392
Other	1943	1346		728	1105		777	209		438	32
Histology
ccRCC	19627	12505	<0.01	7938	10456	<0.01	7751	1842	<0.01	3938	207	<0.01
Chromophobe type	2182	1420		650	1099		750	265		782	56
Papillary adenocar	3629	3663		1562	2875		1223	671		844	117
RCC unspecified	6106	4069		2444	3391		2374	570		1288	108
Other types	1748	998		715	802		607	165		426	31
Tumor size (cm)	5.4 (3.4)	3.1 (2.0)	<0.01	2.9 (0.8)	2.5 (0.8)	<0.01	5.5 (0.8)	5.1 (0.8)	<0.01	10.0 (4.3)	10.3 (7.6)	0.39
Grade
Grade I	3971	3609	<0.01	2099	3211	<0.01	1353	352	<0.01	519	46	0.195
Grade II	16417	11034		6951	9210		6310	1621		3156	203
Grade III	7690	3658		2469	2633		3047	876		2174	149
Grade IV	1210	253		239	156		497	71		474	26
Laterality
Left	16315	10997	0.283	6368	9045	0.204	6295	1676	0.055	3652	276	0.190
Right	16970	11652		6937	9573		6410	1836		3623	243
RLN removed
No	29867	22104	<0.01	12560	18266	<0.01	11515	3360	<0.01	5792	478	<0.01
Yes	3378	514		729	331		1175	143		1474	40
Sequence number
One primary only	29250	20045	0.026	11635	16540	<0.01	11153	3066	0.417	6462	439	0.004
1st of 2 or more primaries	4042	2610		1674	2083		1552	447		816	80
Marital status
Never married	4881	3413	<0.01	1881	2794	<0.01	1843	534	0.133	1157	85	0.384
Ever married	6325	3789		2588	3057		2463	632		1274	100
Married	20605	14336		8269	11841		7818	2192		4518	303
Vital status
Alive	28205	20979	<0.01	11441	17384	<0.01	10771	3150	<0.01	5993	445	0.049
Dead	5087 (0.1528)	1676 (0.0740)		1868 (0.1404)	1239 (0.0665)		1934 (0.1522)	363 (0.1033)		1285 (0.1766)	74 (0.1426)

NE – nephrectomy; ccRCC – clear cell renal cell carcinoma; Papillary adenocar – Papillary adenocarcinoma; RLN – regional lymph nodes. Sequence number: The sequence of renal cell carcinoma of all reportable tumors which occur over the lifetime of a patient. Ever married consisted Divorced, Separated and Widowed. Missing values were omitted for some variables.