Adjusted* ORs (95% CI) for ischaemic stroke in relation to change in frequency of headache
| Change in frequency | Adjustment excluding OCs | Adjustment including OCs |
|---|---|---|
| Relative to non-migraine sufferers (60/188). | ||
| Values in square brackets represent number of cases/number of controls. | ||
| *Adjusted for high blood pressure, smoking categories, family history of migraine, alcohol consumption, social class, and education. | ||
| †One case with unknown value. | ||
| All headaches among migrainous stroke cases† and controls | ||
| Decrease | 0.20 (0.001 to 34.0) [2/5] | 0.21 (0.001 to 60.9) |
| No change | 10.3 (2.14 to 49.5) [14/6] | 11.0 (1.75 to 68.9) |
| Increase | 26.9 (1.33 to 541.6) [2/4] | 39.5 (1.66 to 940.7) |
| Trend | p=0.03 | p=0.02 |
| Migrainous attacks among migraineurs with aura | ||
| Decrease | 2.28 (0.10 to 52.63) [3/3] | 1.85 (0.07 to 48.2) |
| No change | 3.69 (1.20 to 11.36) [15/13] | 2.77 (0.84 to 9.14) |
| Increase | 17.6 (0.12 to 2566) [1/1] | 17.6 (0.12 to 2702) |
| Trend | p=0.01 | p=0.05 |