Table 6.
Diagnostic performance of single dialysis unit diastolic BP measurement at median
| Diastolic BP Cut-point (mmHg) | Median Diastolic BP (mmHg): First Dialysis |
Median Diastolic BP (mmHg): Second Dialysis |
Median Diastolic BP (mmHg): Third Dialysis |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sensitivity | Specificity | LR+ | LR− | Sensitivity | Specificity | LR+ | LR− | Sensitivity | Specificity | LR+ | LR− | |
| ≥ 70 | 96.4 | 43.0 | 1.69 | 0.08 | 85.7 | 44.9 | 1.55 | 0.32 | 100.0 | 54.2 | 2.18 | 0.00 |
| ≥ 75 | 85.7 | 57.9 | 2.04 | 0.25 | 82.1 | 60.8 | 2.09 | 0.29 | 89.3 | 68.2 | 2.81 | 0.16 |
| ≥ 80 | 78.6 | 72.0 | 2.80 | 0.30 | 75.0 | 71.0 | 2.59 | 0.35 | 75.0 | 83.2 | 4.46 | 0.30 |
| ≥ 85 | 60.7 | 80.4 | 3.09 | 0.49 | 42.9 | 84.1 | 2.70 | 0.68 | 60.7 | 88.8 | 5.41 | 0.44 |
| ≥ 90 | 39.3 | 87.9 | 3.23 | 0.69 | 35.7 | 88.8 | 3.19 | 0.72 | 32.1 | 93.5 | 4.91 | 0.72 |
| ≥ 95 | 25.0 | 94.4 | 4.46 | 0.79 | 32.1 | 91.6 | 3.82 | 0.74 | 14.3 | 95.3 | 3.06 | 0.90 |
| AUC (95% CI) | 0.81 (0.73–0.89) | 0.78 (0.68–0.87) | 0.87 (0.81–0.93) | |||||||||
| Youden Index | 0.53 | 0.51 | 0.65 | |||||||||
| BP cut-point at Youden Index | 78.0 | 78.0 | 78.0 | |||||||||
| % correct classification at Youden Index | 71.1% | 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.