Incidence rates (per 1000 patient-years) of thrombosis
| Characteristic of person-month | All thromboses | Arterial thromboses | Venous thromboses | |||
|---|---|---|---|---|---|---|
| Rate ratios | P-values | Rate ratios | P-values | Rate ratios | P-values | |
| Age | ||||||
| 18–39 | 1.0 | 1.0 | 1.0 | |||
| 40–49 | 1.1 | 0.47 | 1.3 | 0.22 | 0.9 | 0.66 |
| 50–59 | 1.2 | 0.46 | 1.5 | 0.13 | 0.8 | 0.53 |
| 60+ | 2.2 | 0.0002 | 3.0 | 0.0001 | 1.1 | 0.70 |
| Sex | ||||||
| Female | 1.0 | 1.0 | 1.0 | |||
| Male | 1.7 | 0.024 | 1.7 | 0.070 | 1.5 | 0.27 |
| Race | ||||||
| Caucasian | 1.0 | 1.0 | 1.0 | |||
| African Amer. | 1.5 | 0.0051 | 1.5 | 0.031 | 1.5 | 0.068 |
| Other | 1.0 | 0.91 | 0.3 | 0.11 | 1.6 | 0.24 |
| Most recent SLEDAI | ||||||
| 0 | 1.0 | 1.0 | 1.0 | |||
| 1–2 | 1.3 | 0.20 | 1.9 | 0.021 | 0.8 | 0.42 |
| 3–4 | 1.6 | 0.024 | 2.5 | 0.0007 | 0.9 | 0.69 |
| 5+ | 3.0 | <0.0001 | 3.5 | <0.0001 | 2.8 | <0.0001 |
| Current prednisone dose | ||||||
| 0 | 1.0 | 1.0 | 1.0 | |||
| 1–9 | 1.5 | 0.038 1 | 1.8 | 0.015 | 1.3 | 0.33 |
| 10–19 | 3.3 | <0.0001 | 3.5 | <0.0001 | 3.2 | <0.0001 |
| 20+ | 6.7 | <0.0001 | 7.0 | <0.0001 | 7.2 | <0.0001 |