Table 3

Diagnostic performance of CT (<6 hours from headache onset)

StudyNSens (%)95% CISpec (%)95% CIFNR (%)95% CIFPR (%)95% CI
Perry et al12953100100 to 100100100 to 1000.00.0 to 0.00.00.0 to 0.0
Backes et al32135100100 to 100100100 to 1000.00.0 to 0.00.00.0 to 0.0
Valle Alonso et al3085100100 to 10098.796.1 to 1000.00.0 to 0.01.30.0 to 3.9
Perry et al (reclassified)23120497.294.2 to 100100100 to 1002.80.0 to 5.80.00.0 to 0.0
Pooled (n=4)237798.796.5 to 10010099.7 to 1001.340.50 to 3.520.000.00 to 0.34
  • FNR, false negative rate; FPR, false positive rate; N, number; Sens, sensitivity; Spec, specificity.