Table 2.

Interventions performed during the study period and the maturation outcome

ParameterSelective Duplex, n=59Routine Duplex, n=59Odds Ratioa (95% CI)P Value
All interventions, n (%)8 (13.6)8 (13.6)1.00 (0.35 to 2.87)>0.99
 Balloon angioplasty4 (6.8)6 (10.2)1.56 (0.42 to 5.83)0.51
 Branch ligation3 (5.1)1 (1.7)0.32 (0.03 to 3.19)0.33
 Reanastomosis1 (1.7)0NANA
 Balloon angioplasty and branch ligation01 (1.7)NANA
Maturation status at week 8, n (%)
 Successful maturation44 (74.6)51 (86.4)2.17 (0.84 to 5.61)0.10
  Clinically and morphologically matureb31 (52.4)24 (40.7)0.62 (0.30 to 1.28)0.20
  Clinically mature but morphologically not mature3 (5.1)10 (16.9)3.81 (0.99 to 14.64)0.08
  Clinically not mature but morphologically mature10 (16.9)17 (28.8)1.98 (0.82 to 4.79)0.13
 Maturation failure
  Clinically and morphologically not mature15 (25.4)8 (13.6)0.46 (0.18 to 1.19)0.10
  • Data are n (%) unless otherwise indicated. Maturation status was judged regardless of the interventions performed beforehand. 95% CI, confidence interval; NA, not applicable.

  • a Odds ratios of the routine duplex group for outcomes with reference to the selective duplex group.

  • b Clinical maturation was defined as successful cannulation for a 4-hour session of hemodialysis with a minimum blood pump rate of 250 ml/min within 8 postoperative weeks. Morphologic maturation was defined as an outflow cephalic vein diameter >6 mm and volume flow >500 ml/min.