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. 2025 Aug 22;11(9):e1780. doi: 10.1097/TXD.0000000000001780

TABLE 1.

Definition of attribute rating scales and weights for optimized policies

Attribute Policy attribute weights Attribute rating scale
Policy A2 Policy B2 Policy C2 Policy D2
Medical urgency 0.096 0.096 0.096 0.096 {1,  if   medically   urgent   candidate 0,  otherwise 
DR mismatch 0.010 0.010 0.016 0.030 {1,  if 0 HLA   DR   mismatches 0.7,  if 1 HLA   DR   mismatch      0,  if 2 HLA   DR   mismatches   
Longevity matching 0.055 0.064 0.043 0.042 {1,  if   KDPI20 and   EPTS20 0,  otherwise 
Blood type 0.093 0.093 0.093 0.093 {1,  if   blood   type   B 0.772,  if   blood   type   O 0.648,  if   blood   type   A 0,  if   blood   type   AB 
cPRA 0.400 0.400 0.400 0.400 0.0751+e9+7.2x+0.7731+e21.9+69.6x+0.1521+e1.47+2.87x,  
where   x   is   log10(100cPRA)
Prior living donor 0.096 0.096 0.096 0.096 {1,  if   prior   donor   and   KDPI85 0,  otherwise 
Pediatric 0.100 0.100 0.100 0.100 {1,  listing   age<18 and   add  t   conds   met 0,  otherwise 
Additional conditions are either KDPI35 or 35<KDPI<85 and donor age < 18.
Safety net 0.032 0.032 0.032 0.032 {1,  liver   safety   net   and   KDPI20 0,  otherwise 
Waiting time 0.039 0.041 0.049 0.051 0.1t,where   t   is   qualifying   wait   time   in   years
Proximity 0.079 0.069 0.075 0.059 {1,  d50 10.15200(d50),  50<d250 0.850.6250(d250),  250<d500 0.250.254681(d500),  500<d5181 0,  5181 
where d is the distance between donor hospital and transplant center in NM. Multiply by 3 if KDPI >85

This table defines the final rating scales considered during the project and the attribute weights of 4 optimized continuous distribution policies. Continuous distribution policies prioritize transplant candidates for a particular donated organ according to a weighted average of rating scale subscores. The attribute weights are the weights used in the weighted average.

cPRA, calculated panel-reactive antibody; EPTS, expected posttransplant survival; KDPI, Kidney Donor Profile Index; NM, nautical miles.