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. Author manuscript; available in PMC: 2014 Oct 21.
Published in final edited form as: Circulation. 2009 Jun 15;119(25):3189–3197. doi: 10.1161/CIRCULATIONAHA.109.848382

Table 3.

Out of Bag (OOB) Concordance Index Values For Cox Regression Models

All-cause death
OOB Concordance Index
(95% Confidence Interval)
Clinical variables only 0.672 (0.646 to 0.698)
Peak VO2 only 0.675 (0.662 t0 0.688)
Time only 0.666 (0.651 to 0.681)
Peak VO2 + Time only 0.679 (0.666 to 0.692)
Clinical variables + Peak VO2 0.699 (0.673 to 0.725)
Clinical variables + Time 0.697 (0.671 to 0.723)
Clinical variables + Peak VO2 + Time 0.698 (0.670 to 0.726)