Table 2. ODX score and BR grading rules used to split the dataset into high, intermediate and low ODX categories.

BCa Groups	Description	Number of cases
High ODX	ODX >30	24
Low ODX	ODX <18	95
Intermediate ODX	18≤ ODX ≤30	55
High ODX-high grade (HH)	Both ODX >30 and BR >7	15
Low ODX-low grade (LL)	Both ODX <18 and BR <6	42
HHc group	All BCa cases that do not belong to HH group	159
LLc group	All BCa cases that do not belong to LL group	132

The corresponding number of cases for each group is presented in the last column.