Metastatic renal cell carcinoma patients of T4 stage who are in status of N1 stage or older than 76 years cannot benefit from cytoreductive nephrectomy

Table 2 The results of propensity score matching (PSM) in subgroups. (only show T4, T4 + AgeII and T4 + N1 subgroups)

	Variables		CN		NS		Significant
T4			No.	%	No	%	P	Method
	N	0	53	55.8	29	58	0.937	chi-square
	N	1	42	44.2	21	42	0.937	chi-square
			Mean	SD	Mean	SD	P	Method
	Age (years)		65.2	11.8	65.9	13.6	0.72	t-test
	Tumor Size (mm)		91.2	42.7	88.9	42	0.754	t-test
T4 + AgeII			No.	%	No	%	P	Method
	N	0	17	81	10	71.4	0.805	chi-square
	N	1	4	19	4	28.6	0.805	chi-square
			Mean	SD	Mean	SD	P	Method
	Tumor Size (mm)		83.8	22.7	82.1	28.8	0.849	t-test
T4 + N1			Mean	SD	Mean	SD	P	Method
	Age (years)		62.9	10.9	61.8	13.2	0.721	t-test
	Tumor Size (mm)		86.4	37.5	89.8	39.8	0.742	t-test

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