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. 2015 Mar 11;10(3):e0118644. doi: 10.1371/journal.pone.0118644

Table 5. Comparison of C-index between different risk models used to predict overall survival.

C-index (95% CI)
DC IVC TVC NTTD
n = 41,780 n = 8,569 n = 6,276 n = 1,285
IHTSA 0.60 (0.59–0.60) 0.59 (0.58–0.60) 0.65 (0.63–0.66) 0.59 (0.56–0.62)
DRI 0.54 (0.54–0.55) 0.54 (0.53–0.55) 0.58 (0.56–0.60) 0.55 (0.52–0.58)*
IMPACT 0.56 (0.55–0.57) 0.55 (0.54–0.56) 0.63 (0.61–0.65) 0.52 (0.49–0.56)
RSS 0.56 (0.56–0.57) 0.56 (0.55–0.57) 0.64 (0.62–0.65) 0.54 (0.51–0.58)*

*p < 0.05

p ≤ 0.001 compared with ITHSA. CI, confidence interval; DC, derivation cohort; DRI, donor risk index for transplantation (reported in the paper by Weiss et al. [6]); IMPACT, index for mortality prediction after cardiac transplantation (reported in the paper by Weiss et al. [7]); ITHSA, international heart transplantation survival algorithm; IVC, internal validation cohort; NTTD, Nordic thoracic transplantation database; RSS, risk-stratification score (reported in the paper by Hong et al. [9]); TVC, temporal validation cohort.