Table 1.
Patient demographics
| Western countries | Non-western countries | P-valuea | |
|---|---|---|---|
| N | 420 | 202 | |
| Female, n (%) | 286 (68.1%) | 129 (63.9%) | 0.34 |
| Age at completion, median [1st quartile, 3rd quartile] | 10 [7, 15] | 11 [8, 15] | 0.50 |
| Age at diagnosis, median [1st quartile, 3rd quartile] | 5 [2, 9] | 5 [3, 10] | 0.04 |
| Self-reported JIA category, n (%) | |||
| Systemic | 57 (13.6%) | 23 (11.4%) | 0.53 |
| Oligoarthritis | 106 (25.2%) | 62 (30.7%) | 0.18 |
| Polyarthritis RF - | 103 (24.5%) | 41 (20.3%) | 0.29 |
| Polyarthritis RF + | 46 (11.0%) | 14 (6.9%) | 0.15 |
| Psoriatic | 21 (5.0%) | 5 (2.5%) | 0.21 |
| ERA | 25 (6.0%) | 12 (5.9%) | > 0.99 |
| Undifferentiated | 19 (4.5%) | 1 (0.5%) | 0.02 |
| Don’t know | 43 (10.2%) | 44 (21.8%) | 0.0002 |
aP-value of the test of differences between western and non-western countries. For categorical data Pearson’s χ2-test was used; for continuous data the Mann-Whitney U test
Abbreviations: ERA enthesitis-related arthritis, JIA juvenile idiopathic arthritis, RF rheumatoid factor