| Variable | Group A One Joint (N = 12) | Group B Two Joints (N = 16) | Group C Three or more Joints (N = 13) | P value Group A vs Group B vs Group C |
|---|---|---|---|---|
| Female Gender (%) | 12 (100%) | 13 (81.3%) | 12 (92.3%) | 0.36 |
| Mean age at diagnosis SLE, years (range) | 32.7 (5-58) | 23.9 (8-43) | 24.1 (14-36) | 0.34 |
| Median duration SLE to diagnosis of AVN, years (range) | 11 (1-23) | 10 (1-40) | 13 (1-32) | 0.63 |
| Mean length of follow-up from diagnosis of AVN, months (range) | 46.8 (0-220) | 54.2 (0-129) | 89.9 (0-228) | 0.11 |
| Mucocutaneous, No. (%) | 7 (58.3%) | 11 (68.8%) | 9 (69.2%) | 0.84 |
| Arthritis, No. (%) | 11 (91.7%) | 13 (81.3%) | 11 (84.6%) | 0.86 |
| Nephritis, No. (%) | 7 (58.3%) | 11 (68.8%) | 9 (69.2%) | 0.84 |
| CNS disease, No. (%) | 0 | 2 (12.5%) | 6 (46.2%) | 0.01 |
| Hematologic, No. (%) | 2 (16.7%) | 9 (56.3%) | 7 (53.8%) | 0.08 |
| SLICC/ACR damage index, median (range) | 4.5 (1-9) | 3 (2-8) | 4 (2-7) | 0.48 |