Table 6.

Diagnostic performance of single dialysis unit diastolic BP measurement at median

Diastolic BP Cut-point (mmHg)Median Diastolic BP (mmHg): First DialysisMedian Diastolic BP (mmHg): Second DialysisMedian Diastolic BP (mmHg): Third Dialysis
SensitivitySpecificityLR+LRSensitivitySpecificityLR+LRSensitivitySpecificityLR+LR
≥ 7096.443.01.690.0885.744.91.550.32100.054.22.180.00
≥ 7585.757.92.040.2582.160.82.090.2989.368.22.810.16
≥ 8078.672.02.800.3075.071.02.590.3575.083.24.460.30
≥ 8560.780.43.090.4942.984.12.700.6860.788.85.410.44
≥ 9039.387.93.230.6935.788.83.190.7232.193.54.910.72
≥ 9525.094.44.460.7932.191.63.820.7414.395.33.060.90
AUC (95% CI)0.81 (0.73–0.89)0.78 (0.68–0.87)0.87 (0.81–0.93)
Youden Index0.530.510.65
BP cut-point at Youden Index78.078.078.0
% correct classification at Youden Index71.1%71.9%80.7%
  • BP, blood pressure; LR+, likelihood ratio for positive test result; LR, likelihood ratio for negative test result; AUC, area under receiver operating characteristic curve; CI, confidence interval.