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| Subgroups | Studies | Sensitivity, % (95%CI) | Specificity, % (95%CI) |
|---|---|---|---|
| Study design | |||
| Prospective | 10 | 81(76–86) | 94(85–98) |
| Retrospective | 10 | 69(66–72) | 98(96–99) |
| Unclear | 5 | 81(75–86) | 100(85–100) |
| Time from symptom onset to CTP acquisition | |||
| ≤6 hours | 12 | 78(74–82) | 93 (86–97) |
| 6–24 hours | 11 | 73(70–76) | 99(97–99) |
