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Table 4 Accuracy of adequate NTS urgency and final urgency allocation for detecting TIA/stroke/other LTEs

From: Accuracy of telephone triage in patients suspected of transient ischaemic attack or stroke: a cross-sectional study

  Adequate NTS urgency allocationc
Value (95% CI)
Adequate final urgency allocationc
Value (95% CI)
TIA/strokea Sensitivity 0.71 (0.68–0.75) 0.86 (0.84–0.89)
Specificity 0.46 (0.42–0.50) 0.38 (0.34–0.42)
Positive predictive value 0.41 (0.38–0.43) 0.42 (0.40–0.44)
Negative predictive value 0.75 (0.72–0.78) 0.84 (0.81–0.87)
Other LTEsb Sensitivity 0.74 (0.61–0.84) 0.82 (0.70–0.91)
Specificity 0.40 (0.37–0.43) 0.32 (0.30–0.35)
Positive predictive value 0.06 (0.05–0.07) 0.06 (0.05–0.06)
Negative predictive value 0.97 (0.95–0.98) 0.97 (0.95–0.98)
TIA/stroke and other LTEs Sensitivity 0.72 (0.68–0.75) 0.86 (0.83–0.89)
Specificity 0.48 (0.43–0.52) 0.40 (0.36–0.44)
Positive predictive value 0.62 (0.60–0.64) 0.63 (0.62–0.65)
Negative predictive value 0.58 (0.54–0.62) 0.70 (0.66–0.74)
  1. aPrevalence TIA/minor stroke 34.2% and prevalence major stroke 15.8%; bPrevalence other LTEs 4.8%; cFor TIA/minor stroke urgencies U1, U2 and U3 were all considered adequate, for major stroke and other LTEs urgencies U1 and U2 were considered adequate