Performance of the Ottawa subarachnoid haemorrhage rule on internal and external validation
| n | Validation | Sensitivity | Specificity | |
|---|---|---|---|---|
| Perry6 | 2,131 | Internal | 100% | 15% |
| Bellolio8 | 545 | External | 100% | 7.6% |
| Kimuraa9 | 1,561 | External | 100% | 8.8% |
| Perry10 | 1,153 | External | 100% | 13.6% |
| Chu11 | 149 | External | 100% | 22% |
| Pathan17 | 145 | External | 100% | 44% |
| Chueng18 | 500 | External | 94% | 33% |
| Perry19 | 3,672 | External | 100% | 12.7% |
↵a = modified Ottawa subarachnoid haemorrhage rule was utilised, consisting of age ≥40 years, neck pain or stiffness, altered level of consciousness or onset during exertion.