IRs of thrombosis according to stage of disease, using the Ann Arbor staging system
| Stage . | No. patients . | No. events . | IR, % (95% CI) . |
|---|---|---|---|
| I | 80 | 4 | 5.0 (1.98-13.3) |
| II | 271 | 21 | 7.7 (5.0-11.9) |
| III | 160 | 11 | 6.9 (3.8-12.4) |
| IV | 382 | 44 | 11.5 (8.6-15.5) |
| Stage . | No. patients . | No. events . | IR, % (95% CI) . |
|---|---|---|---|
| I | 80 | 4 | 5.0 (1.98-13.3) |
| II | 271 | 21 | 7.7 (5.0-11.9) |
| III | 160 | 11 | 6.9 (3.8-12.4) |
| IV | 382 | 44 | 11.5 (8.6-15.5) |
95% CI indicates 95% confidence interval; and IR, incidence rate.
P = .14 for differences according to stage of disease.