Table 2.
Performance of the Dutch triage system on major events and acute coronary syndrome among 1,434 patients (2017).
| TP | FP | FN | TN | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | Accuracy (%) | |
|---|---|---|---|---|---|---|---|---|---|
| Major event | |||||||||
| NTS urgency | 195 | 691 | 40 | 508 | 83.0 [77.6–87.6] |
42.4 [39.6–45.2] |
22.0 [20.7–23.3] |
92.7 [90.5–94.4] |
49.0 [46.4–51.7] |
| Final urgency | 199 | 693 | 36 | 506 | 84.7 [79.4–89.0] |
42.2 [39.4–45.1] |
22.3 [21.1–23.6] |
93.4 [91.2–95.0] |
49.2 [46.5–51.8] |
| Urgent referrals | 210 | 457 | 25 | 742 | 89.4 [84.7–93.0] |
61.9 [59.1–64.6] |
31.5 [29.7–33.3] |
96.7 [95.3–97.7] |
66.4 [63.9–68.8] |
| ACS | |||||||||
| NTS urgency | 84 | 802 | 14 | 534 | 85.7 [77.2–92.0] |
40.0 [37.3–42.7] |
9.5 [8.7–10.3] |
97.5 [95.9–98.4] |
43.1 [40.5–45.7] |
| Final urgency | 85 | 807 | 13 | 529 | 86.7 [78.4–92.7] |
39.6 [37.0–42.3] |
9.5 [8.8–10.3] |
97.6 [96.1–98.6] |
42.8 [40.2–45.4] |
| Urgent referrals | 93 | 574 | 5 | 762 | 94.9 [88.5–98.3] |
57.0 [54.3–59.7] |
13.9 [13.0–14.9] |
99.4 [98.5–99.7] |
59.6 [57.0–62.2] |
The table illustrates the performance of the triage system in out-of-hours primary care in the Netherlands, regarding the occurrence of a major event and acute coronary syndrome. Diagnostic properties are presented as percentages [95%-CI]. “NTS urgency” reflects the initial urgency recommendation provided by the NTS algorithm, while “Final urgency” represents the concluding urgency levels after triage assistants’ revisions. “Urgent referrals” represent the course of action after contact with the OOH-PC facility. Abbreviations: ACS, acute coronary syndrome; FN, false negative; FP, false positive; NPV, negative predictive value; PPV, positive predictive value; TN, true negative; TP, true positive.