Table 2.

All primary accesses—comparing proportions and rates of accesses requiring interventions (n=906)

Access Lifetime InterventionVascular Access TypeComparison
Fistula (n=696)Graft (n=210)
Proportionsn (%)an (%)a% Difference (95% CI)P Valueb
 Angioplasty239 (34%)88 (42%)8% (0.19% to 15%)0.05
 Angiogram95 (14%)17 (8%)6% (0.44% to 10%)0.03
 Thrombolysis56 (8%)72 (34%)26% (20% to 33%)<0.001
 Revisions58 (8%)11 (5%)3% (−1% to 6%)0.14
 CVC insertion154 (22%)30 (14%)8% (2% to 13%)0.01
 CVC removal236 (34%)79 (38%)4% (−4% to 11%)0.34
 CVC usec398 (57%)112 (53%)4% (−4% to 12%)0.32
RatesndPer 1000 Access DaysndPer 1000 Access DaysIncident Rate Ratio (95% CI)P Valuee
 Angioplasty6840.643451.580.40 (0.0020 to 81.69)<0.001
 Angiogram1270.12200.091.29 (1.07 to 1.49)0.29
 Thrombolysis790.071740.800.09 (0.00019 to 45.32)<0.001
 Fistula or graft revisions580.05110.051.07 (21.19 to 0.051)0.83
 New CVC insertion2070.19360.171.17 (1.4941 to 0.8967)0.38
 CVC removal2630.25860.390.62 (0.042 to 9.27)<0.001
Access lengthMeanMeanMean Difference (95% CI)P Valuef
 AV access days1539.211038.53500.67 (289.40 to 711.94)<0.001
 CVC days214.74145.4069.34 (12.10 to 126.58)0.02
  • CVC, central venous catheter; AV, arteriovenous.

  • a n is the number of accesses and % is the proportion of accesses with at least one intervention during the access lifetime.

  • b Proportions compared using chi-squared test.

  • c Had a CVC in situ any time during the access lifetime.

  • d n is the total number of procedures performed in all accesses of that type.

  • e Rates compared using the Fisher exact test.

  • f Means compared using independent samples t test.