Table 5.

Diagnostic performance of single dialysis unit systolic BP measurement at median

Systolic BP Cut-point (mmHg)Median Systolic BP (mmHg): First DialysisMedian Systolic BP (mmHg): Second DialysisMedian Systolic BP (mmHg): Third Dialysis
SensitivitySpecificityLR+LRSensitivitySpecificityLR+LRSensitivitySpecificityLR+LR
≥ 12596.243.41.700.0994.256.62.170.1094.256.62.170.10
≥ 13090.460.22.270.1682.768.72.640.2592.369.93.060.11
≥ 13586.569.92.870.1982.775.93.430.2386.578.33.990.17
≥ 14080.878.33.720.2578.981.94.360.2680.884.35.160.23
≥ 14575.084.34.790.3076.984.34.910.2771.286.85.370.33
≥ 15063.588.05.270.4263.590.46.580.4051.991.66.160.53
AUC (95% CI)0.86 (0.80–0.92)0.87 (0.82–0.93)0.89 (0.83–0.94)
Youden Index0.600.610.68
BP cut-point at Youden Index147.0140.0136.0
% correct classification at Youden Index81.5%80.7%83.7%
  • 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.