Table 2.

Comparison of the age composition of RCC patients in five periods

	Under 18		18–64		Over 65		χ2	P
	N	Ratio/%	N	Ratio/%	N	Ratio/%
2013–2014 (N = 1407)	2	0.2	1108	78.7	297	21.1	10.615	0.225
2015–2016 (N = 1734)	5	0.3	1370	79.0	359	20.7
2017–2018 (N = 1924)	5	0.3	1472	76.5	447	23.2
2019–2020 (N = 1908)	4	0.2	1440	75.5	464	24.3
2021–2022 (N = 2137)	3	0.2	1659	77.6	475	22.2

^* RCC, renal cell carcinoma