Stroke subtype | Sensitivity% (95% CI) | Specificity% (95% CI) | PPV% (95% CI) | NPV% (95% CI) | LR+ (95% CI) | LR− (95% CI) |
---|---|---|---|---|---|---|
GFAP (n = 299) | ||||||
ICrH | 25.0 (11.5–43.4)a | 100.0 (98.6–100.0)a | 100.0 (63.1–100.0)a | 91.8 (88.0–94.6)a | – | 0.75 (0.61–0.92)a |
PreSS part 1 (n = 299) Stroke/TIA suspected if PreSS part 1 ≥ 1 | ||||||
Stroke/TIA | 94.4 (89.9–97.3) | 17.4 (11.1–25.3) | 62.7 (56.6–68.5) | 67.7 (48.6–83.3) | 1.14 (1.04–1.25) | 0.32 (0.16–0.66) |
PreSS part 2 (n = 268) LVO suspected if PreSS part 1 ≥ 1 and PreSS part 2 ≥ 2 | ||||||
LVO | 55.6 (35.3–74.5) | 77.2 (71.4–82.3) | 21.4 (12.5–32.9) | 93.9 (89.7–96.8) | 2.43 (1.62–3.67) | 0.58 (0.38–0.88) |
PreSS and GFAP combined (as used in the decision tree) | ||||||
Step 1 Stroke and TIA (Group 4) | 94.4 (89.9–97.3) | 17.4 (11.1–25.3) | 62.7 (56.6–68.5) | 67.7 (48.6–83.3) | 1.14 (1.04–1.25) | 0.32 (0.16–0.66) |
Step 2 ICrH (Group 1) | 25.0 (11.5–43.4)a | 100.0 (98.6–100.0)a | 100.0 (63.1–100.0)a | 91.8 (88.0–94.6)a | – | 0.75 (0.61–0.92)a |
Step 3 LVO (Group 2) | 55.6 (35.3–74.5)a | 82.4 (77.3–86.7)a | 23.8 (14.0–36.2)a | 94.9 (91.3–97.3)a | 3.15 (2.06–4.81)a | 0.54 (0.35–0.83)a |