Table 4.

Association of access type and failure-to-mature risk stratum with access-related cost at 1, 3, and 5 yr and over time (n=662, n=419, n=275, n=275, respectively)

Log CostFactorMain EffectsMain and Interaction Effects
Effect Estimate (95% CI)P ValueEffect Estimate (95% CI)P Value
1 yraYear of creation0.99 (0.99 to 0.99)<0.0010.99 (0.99 to 0.99)<0.001
High riskb1.11 (1.06 to 1.16)<0.0011.19 (1.09 to 1.31)<0.001
Moderate riskb1.02 (0.98 to 1.06)0.241.07 (0.99 to 1.17)0.10
Fistulac0.96 (0.92 to 1.00)0.051.02 (0.94 to 1.10)0.67
High risk×fistulad0.91 (0.81 to 1.01)0.07
Moderate risk×fistulad0.94 (0.85 to 1.04)0.22
3 yraYear of creation0.98 (0.97 to 0.99)<0.0010.98 (0.97 to 0.99)<0.001
High riskb1.14 (1.05 to 1.24)0.0021.27 (1.06 to 1.52)0.01
Moderate riskb1.07 (1.01 to 1.14)0.041.15 (0.99 to 1.36)0.07
Fistulac0.82 (0.76 to 0.88)<0.0010.89 (0.77 to 1.03)0.10
High risk×fistulad0.88 (0.72 to 1.08)0.22
Moderate risk×fistulad0.91 (0.77 to 1.08)0.29
5 yraYear of creation0.98 (0.97 to 0.99)<0.0010.98 (0.97 to 0.99)<0.001
High riskb1.22 (1.08 to 1.38)0.0011.64 (1.14 to 2.36)0.008
Moderate riskb1.08 (0.99 to 1.18)0.071.27 (0.98 to 1.66)0.07
Fistulac0.86 (0.76 to 0.96)0.0081.00 (0.79 to 1.27)0.99
High risk×fistulad0.72 (0.49 to 1.06)0.09
Moderate risk×fistulad0.84 (0.63 to 1.11)0.21
Over timee5 yrf1.24 (1.20 to 1.27)<0.0011.24 (1.20 to 1.28)<0.001
3 yrf1.16 (1.13 to 1.19)<0.0011.16 (1.13 to 1.19)<0.001
High riskb1.14 (1.03 to 1.27)0.011.44 (1.09 to 1.91)0.01
Moderate riskb1.04 (0.97 to 1.11)0.311.14 (0.93 to 1.39)0.21
Fistulac0.92 (0.84 to 1.02)0.101.02 (0.85 to 1.21)0.85
High risk×fistulad0.77 (0.57 to 1.04)0.09
Moderate risk×fistulad0.90 (0.73 to 1.12)0.35
  • a Log-linear model.

  • b Reference is low risk.

  • c Reference is graft.

  • d Interaction term.

  • e Generalized estimating equation.

  • f Reference is 1 Year.