Patient demographics*. Values are n (%) or mean ± SD.
| Characteristic | AVN, n = 37 | Controls, n = 111 |
|---|---|---|
| Female | 30 (81) | 82 (74) |
| Age at cSLE diagnosis, yrs | 13.8 ± 2.5 | 13.8 ± 2.4 |
| Age at AVN diagnosis, yrs | 16.1 ± 2.1 | N/A |
| Mean disease duration to AVN, yrs | 2.3 ± 2.02 | N/A |
| Mean followup†, yrs | 6.89 ± 5.39 | 5.72 ± 5.09 |
| Ethnicity | ||
| South Asian | 10 (27) | 10 (9) |
| Other Asian‡ | 9 (24) | 30 (27) |
| Black | 9 (24) | 12 (11) |
| White | 8 (22) | 40 (36) |
| Hispanic | 0 | 1 (1) |
| Other | 1 (3) | 13 (12) |
| Unknown | 0 | 5 (5) |
↵* All comparisons between AVN cases and controls were nonsignificant.
↵† Followup duration was defined as time from cSLE diagnosis to last visit date or June 2013, whichever was earlier.
↵‡ Includes Southeast Asian, East Asian, West Asian, and mixed Asian ethnicities. AVN: avascular necrosis; cSLE: childhood-onset systemic lupus erythematosus; N/A: not applicable.