Table 5.

Percentage of Fistulas that Met Surrogate US Maturation Criteria

Note.—Numbers in parentheses are the number of patients used to calculate the percentages. The UAB criteria were fistula vein flow of at least 500 mL/min and mean fistula vein diameter of at least 0.4 cm (11). The KDOQI criteria were fistula vein flow of at least 600 mL/min and mean fistula vein diameter of at least 0.6 cm (13). Multiple imputation was used to impute values for missing fistula blood flow rates and mean fistula inner vein diameter prior to participant death or fistula thrombosis. Participants who died or experienced thrombosis prior to the scheduled US measurements were classified as failing to meet the designated flow or diameter criteria.