Table 2.

Summarized patient characteristics of the external validation set (n = 445) compared with the original derivation set (n = 422)

VariableDerivation Set (Original from UHN)Validation Set
UHNNon-UHNTotal
N42295350445
Age ≥65 yr184 (43.6%)24 (25.3%)147 (42.0%)171 (38.4%)
PVD36 (8.3%)7 (7.4%)63 (18.0%)70 (15.7%)
CAD136 (32.2%)28 (29.5%)128 (36.6%)156 (35.1%)
White278 (65.8%)58 (61.1%)178 (50.9%)236 (53.0%)
Previous graft5 (1.2%)3 (3.3%)2 (<1%)5 (1.1%)
Previous catheter214 (50.7%)54 (56.3%)122 (35.1%)176 (39.6%)
Prehemodialysis194 (46.0%)20 (20.8%)125 (35.9%)145 (32.6%)
Mean score3.0 (±2.4)2.6 (±2.6)3.8 (±2.4)3.5 (±2.5)
  • aTwice the proportion of patients had PVD and 1.42 times more were nonwhite in the validation set compared with the derivation set. UHN, University Health Network.