| Factor | Category | No anemia (N = 26) | Anemia (N = 23) | p-value | ||
| Age (years) | 2 - 6 | 4 | 30.8 | 9 | 69.2 |
|
| 6 - 12 | 13 | 65.8 | 6 | 31.6 |
| |
| 12 - 18 | 9 | 52.9 | 8 | 47.1 | 0.111 | |
| Gender | Male | 11 | 52.4 | 10 | 47.6 |
|
| Female | 15 | 53.6 | 13 | 46.4 | 0.934 | |
| Diagnosis | JIA | 19 | 50.0 | 19 | 50.0 |
|
| SLE | 5 | 62.5 | 3 | 37.5 |
| |
| Kawazaki D | 0 | 0.0 | 1 | 100.0 |
| |
| Reactive Arthritis | 1 | 100.0 | 0 | 0.0 |
| |
| JD | 1 | 100.0 | 0 | 0.0 | 0.504 | |
| JIA vs others | JIA | 19 | 50.0 | 19 | 50.0 |
|
| Other diseases | 7 | 63.6 | 4 | 36.4 | 0.425F | |
| JIA Subtype§ | Polyarthritic | 9 | 56.3 | 7 | 43.8 |
|
| Systemic | 7 | 50.0 | 7 | 50.0 |
| |
| Oligoarthritic | 2 | 28.6 | 5 | 71.4 |
| |
| Psoriatic | 1 | 100.0 | 0 | 0.0 | 0.469 | |
| Systemic JIA§ | Systemic | 7 | 50.0 | 7 | 50.0 |
|
| Others | 12 | 50.0 | 12 | 50.0 | 1.000F | |
| ESR | Normal | 14 | 66.7 | 7 | 33.3 |
|
| Elevated | 5 | 31.3 | 11 | 68.8 | 0.049*F | |
| CRP | Normal | 17 | 54.8 | 14 | 45.2 |
|
| Elevated | 6 | 40.0 | 9 | 60.0 | 0.345 | |
| ESR or CRP | Both normal | 15 | 65.2 | 8 | 34.8 |
|
| One elevated | 7 | 41.2 | 10 | 58.8 |
| |
| Both elevated | 2 | 2.6 | 5 | 71.4 | 0.140 | |
| Iron therapy | No | 20 | 64.5 | 11 | 35.5 |
|
| Yes | 6 | 33.3 | 12 | 66.7 | 0.035* | |
| Serum ferritin | Low | 1 | 100.0 | 0 | 0.0 |
|
| Optimal (7 - 140) | 4 | 30.8 | 9 | 69.2 |
| |
| High | 3 | 42.9 | 4 | 57.1 | 0.370 | |