Table 3 Sudden AND severe headache causation by group and type of publication
Cause | Cohort (N) | % | Case (N) | % | Case series | % | All (N) | % |
|---|---|---|---|---|---|---|---|---|
Idiopathic thunderclap headache | 265 | 16 | 87 | 27 | 107 | 29 | 459 | 20 |
Other, not specified | 457 | 28 | 18 | 6 | 0 | 0 | 475 | 20 |
Primary headache | 447 | 27 | 0 | 0 | 0 | 0 | 447 | 19 |
Cerebrovascular | 281 | 17 | 153 | 47 | 198 | 53 | 632 | 27 |
Infection | 119 | 7 | 17 | 5 | 24 | 6 | 160 | 7 |
Unknown | 49 | 3 | 0 | 0 | 0 | 0 | 49 | 2 |
Non-neurovascular | 27 | 2 | 46 | 14 | 46 | 12 | 119 | 5 |
Sudden death with headache | 4 | 0.2 | 0 | 0 | 0 | 0 | 4 | 0 |
Total | 1,649 | 100 | 321 | 99 | 375 | 100 | 2345 | 100 |