Table 2.
Risk of Stroke during Sequential 2-Week Intervals after Cervical Artery Dissectiona,b
| Time Interval after Dissection | Case Period (%) | Crossover Period (%) | Absolute Risk Difference (95% CI) |
|---|---|---|---|
| Weeks 0–2 | 1.25 | 0 | 1.25 (0.84–1.67) |
| Weeks 3–4 | 0.18 | 0 | 0.18 (0.02–0.34) |
| Weeks 5–6 | 0.11 | 0 | 0.11 (−0.01–0.23) |
| Weeks 7–8 | 0.04 | 0 | 0.04 (−0.03–0.11) |
| Weeks 9–10 | 0.04 | 0 | 0.04 (−0.03–0.11) |
| Weeks 11–12 | 0.07 | 0 | 0.07 (−0.03–0.17) |
Abbreviations: CI, confidence interval
a
Data for the case period are for the indicated interval after cervical artery dissection. Data for the crossover period are for the indicated interval plus 1 year after cervical artery dissection.