Table 4.

Multivariable regression of cancer specific mortality (competing risk model) stratified by T stage.

Outcomes	Methods	Variables	T1a	T1b	T2
Cancer specific mortality	Multivariable*	Nephrectomy	Reference	Reference	Reference
		NSS	0.565 (0.461–0.691)	0.792 (0.625–1.004)	0.739 (0.490–1.116)
			P<0.01	P=0.054	P=0.150
	PS adjusted	Nephrectomy	Reference	Reference	Reference
		NSS	0.595 (0.485–0.729)	0.800 (0.632–1.012)	0.791 (0.530–1.181)
			P<0.01	P=0.062	P=0.251
	SMRW	Nephrectomy	Reference	Reference	Reference
		NSS	0.522 (0.428–0.636)	0.935 (0.759–1.153)	0.732 (0.507–1.057)
			P<0.01	P=0.532	P=0.096

^*Adjusted for age, gender, race, histology, tumor size, grade, laterality, RLN removed, sequence number and marital status.

PS – propensity score; SMRW – standardized mortality ratio weight; NSS – nephron sparing surgery. Cancer specific mortality was calculated using Fine and Gray model.