Data on 219 patients with JIA and 80 controls at the first DEXA evaluation.
| Characteristic | JIA | Controls (n) | p |
|---|---|---|---|
| No. of patients at first DEXA (F:M) | 155:64 | 56:24 | NS |
| Age at first DEXA, yrs ± SD | 8.5 ± 3.3 | 8.5 ± 4.0 | NS |
| Type of JIA onset (%) | |||
| Oligoarticular | 105 (48) | ||
| Polyarticular | 61 (28) | — | — |
| Systemic | 20 (9) | ||
| Enthesitis-related arthritis | 34 (15) | ||
| Age at diagnosis, yrs ± SD | 5.0 ± 3.8 | ||
| Oligoarticular | 4.7 ± 2.7 | ||
| Polyarticular | 5.7 ± 3.7 | — | — |
| Systemic | 4.0 ± 3.4 | ||
| Enthesitis-related arthritis | 8.5 ± 2.7 | ||
| Disease duration, yrs ± SD | 3.5 ± 3.0 | ||
| Oligoarticular | 3.6 ± 2.9 | ||
| Polyarticular | 3.1 ± 3.2 | — | — |
| Systemic | 3.2 ± 3.1 | ||
| Enthesitis-related arthritis | 3.1 ± 2.6 | ||
| Height (SDS) | −0.6 ± 1.1 | −0.1 ± 0.9 | < 0.05 |
| BMI (SDS) | −0.3 ± 0.8 | 0.1 ± 0.7 | NS |
| BMAD L2-L4 SDS | |||
| Oligoarticular | −0.41 ± 0.7 | 0.02 ± 0.9 | < 0.005 |
| Polyarticular | −0.63 ± 0.8 | 0.02 ± 0.9 | < 0.001 |
| Systemic | −1.41 ± 0.7 | 0.02 ± 0.9 | < 0.001 |
| Enthesitis-related arthritis | −0.09 ± 0.5 | 0.02 ± 0.9 | NS |
| Total | −0.78 ± 1.00 | 0.02 ± 0.9 | NS |
JIA: juvenile idiopathic arthritis; DEXA: dual energy x-ray absorptiometry; SDS: standard deviation scores; BMAD: bone mineral apparent density; BMI: body mass index; NS: nonsignificant.