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Stroke admissions within 30 days from headache visit by brain MRIa
| HR (compared to renal colic) | HR (compared to back pain) | |
|---|---|---|
| All stroke | ||
| Headache without MRI | 2.70 (95% CI,2.30–3.18) | 4.0 (95% CI, 3.77–4.3) |
| Headache with MRI | 1.47 (95% CI, 1.22–1.78) | 1.49 (95% CI, 1.24–1.80) |
Abbreviations: CI, confidence interval; HR, hazard ratio; MRI, magnetic resonance imaging.
Model adjusted for age, race/ethnicity, and all vascular comorbidities.
