. Author manuscript; available in PMC: 2011 Oct 6.

Published in final edited form as: Prostate Cancer Prostatic Dis. 2009 Nov 17;13(1):87–93. doi: 10.1038/pcan.2009.48

Table 5.

Concordance indexes of various models for predicting biochemical recurrence by race in the DPC cohort

Nomogram	All patients			Caucasian			African American			C-index difference^a
	C-index	N^b	R^c	C-index	N^b	R^c	C-index	N^b	R^c
Preoperative
D'Amico	0.6331	3491	1052	0.6266	2952	872	0.6604	539	180	−0.0338
CAPRA	0.6816	1987	447	0.6759	1678	366	0.7055	309	81	−0.0296
Kattan preop	0.6829	1979	445	0.682	1670	364	0.6826	309	81	−0.0004
Postoperative
DPC	0.7354	2948	746	0.7259	2488	614	0.7771	460	132	−0.0511
Kattan postop	0.7231	3323	950	0.7173	2831	801	0.7551	492	149	−0.0378
CPDR/CAPSURE	0.6759	3642	1117	0.6782	3084	926	0.7389	562	176	−0.0248
JHH	0.6717	4044	1279	0.6611	3482	1103	0.7389	562	176	−0.0778
Average	0.6862	3059	862	0.6810	2598	721	0.7175	461	141	−0.0365

Abbreviations: DPC, Duke Prostate Center; JHH, Johns Hopkins Hospital.

C-index difference denotes the C-index in Caucasian minus C-index in African American.

N: number of subjects in the model.

R: number of recurrences in the model.