Table 1. Characteristics of study cohort.

	RCC (n = 56)	Control (n = 56)	P value
Age (year)
mean ± SD	52.9 ± 12.6	48.2 ± 9.0	0.027
median (IQR)	54 (44–62)	49 (40–57)
Gender, n (%)			1.000
male	35 (62.5)	35 (62.5)
female	21 (37.5)	21 (37.5)
Size (cm)
mean ± SD	3.64 ± 3.36
median (IQR)	2.7 (2–3.8)
Stage, n (%)
T1a	43 (76.8)
T1b	6 (10.7)
T2a	2 (3.6)
T2b	2 (3.6)
T3a	3 (5.4)
Furmann grade, n (%)
I–II	36 (64.3)
III–IV	20 (35.7)
Cell type, n (%)
clear cell	44 (78.6)
non-clear	12 (21.4)

RCC = renal cell cancer, SD = standard deviation, IQR = interquartile range.