Table 4.
Single-Study Predictors of SAH from History and Physical Exam Available
| Risk Factor | Sensitivity, % (95% CI) |
Specificity, % (95% CI) |
Positive LR (95% CI) |
Negative LR (95% CI) |
|---|---|---|---|---|
|
| ||||
| Diplopia | ||||
| Landtblom 2002 | 0 (0-15) | 98 (94-100) | 0.96 (0.05-19.33) | 1.00 (0.94-1.07) |
|
| ||||
|
Family History cerebral
aneurysm |
||||
| Czuczman 2013 | 0 (0-13) | 92 (87-95) | 0.22 (0.01-3.54) | 1.07 (1.00-1.15) |
|
| ||||
| Lethargy | ||||
| Morgenstern 1998 | 39 (17-64) | 82 (72-90) | 2.19 (1.04-4.64) | 0.74 (0.51-1.09) |
|
| ||||
| Onset < 1 minute | 50 (34-66) | 45 (32-58) | 0.91 (0.62-1.33) | 1.11 (0.74-1.68) |
| Linn 1998 | ||||
|
| ||||
| Onset 1-5 minutes | 24 (12-39) | 87 (75-94) | 1.79 (0.77-4.14) | 0.88 (0.72-1.07) |
| Linn 1998 | ||||
|
| ||||
| Onset <1 hour | 100 (95-100) | 12 (9-16) | 1.13 (1.09-1.19) | 0.06 (0-0.95) |
| Bo 2008 | ||||
|
| ||||
| PMH chronic headache | 19 (7-39) | 79 (73-85) | 0.93 (0.40-2.91) | 1.02 (0.83-1.24) |
| Czuczman 2013 | ||||
|
| ||||
| PMH of hypertension | 31 (14-52) | 80 (74-85) | 1.53 (0.81-2.91) | 0.87 (0.66-1.13) |
| Czuczman 2013 | ||||
|
| ||||
| Scotomata | 0 (0-15) | 93 (87-97) | 0.28 (0.02-4.72) | 1.06 (0.98-1.14) |
| Landtblom 2002 | ||||
|
| ||||
| Similar headache in past | 19 (9-34) | 90 (79-96) | 1.90 (0.71-5.09) | 0.90 (0.76-1.07) |
| Linn 1998 | ||||