Table 3.
Associations between control variables and primary predictor variables
| Oligoarthritis (n = 31) | Seronegative polyarthritis (n = 31) | p value | |||
|---|---|---|---|---|---|
| N (%) | N (%) | ||||
| Sex | 0.02a | ||||
| Girls | 19 (61.3) | 27 (87.1) | |||
| Boys | 12 (38.7) | 4 (12.9) | |||
| Age at diagnosis of JIA (years) | |||||
| Mean | 7.2 | 5.9 | 0.213b | ||
| Median | 6.2 | 4.8 | |||
| Age group at diagnosis of JIA (years) | 0.204a | ||||
| < 5.3 | 13 (41.9) | 18 (58.1) | |||
| ≥ 5.3 | 18 (58.1) | 13 (41.9) | |||
| Delay from diagnosis of JIA to diagnosis of TMJ involvement (weeks) | |||||
| Mean | 74.4 | 63.7 | 0.757b | ||
| Median | 38.6 | 25.5 | |||
| Delay from diagnosis of JIA to diagnosis of TMJ involvement (weeks) | 0.204a | ||||
| < 33.0 | 13 (41.9) | 18 (58.1) | |||
| ≥ 33.0 | 18 (58.1) | 13 (41.9) | |||
| Anti-nuclear antibody (ANA)c | 1.000a | ||||
| Positive | 17 (54.8) | 17 (54.8) | |||
| Negative | 14 (45.2) | 14 (45.2) | |||
| Human leucocyte antigen B27 (HLA-B27)d | 0.942a | ||||
| Positive | 7 (24.1) | 7 (23.3) | |||
| Negative | 22 (75.9) | 23 (76.7) | |||
| Medication at the time of TMJ involvement | 0.319a | ||||
| Yes | 24 (77.4) | 27 (87.1) | |||
| No | 7 (22.6) | 4 (12.9) |
aChi-square
bMann–Whitney
cMissing n = 0
dMissing n = 3
JIA juvenile idiopathic arthritis
TMJ temporomandibular joint