Table 2.
Demographic and health characteristics
| Total sample | ||||
| N | Mdn | IQR 25% | IQR 75% | |
| Age (years) | 164 | 51.0 | 38.8 | 61.0 |
| Tender joint count 28 (N) | 163 | 0.0 | 0.0 | 1.0 |
| Swollen joint count 28 (N) | 163 | 0.0 | 0.0 | 0.0 |
| VAS patient global (mm) | 164 | 50.0 | 30.0 | 62.5 |
| ESR (mm/h) | 144 | 9.0 | 5.0 | 18.0 |
| CRP (mg/L) | 159 | 5.0 | 5.0 | 6.0 |
| DAS28 (CRP) | 143 | 2.4 | 1.7 | 3.1 |
| n | % | |||
| Female | 113 | 68.9 | ||
| RF (positive) | 23/153 | 15.0 | ||
| ACPA (positive) | 7/142 | 4.9 | ||
| IRD patients | ||||
| N | Mdn | IQR 25% | IQR 75% | |
| Age (years) | 54 | 54.0 | 38.2 | 67.8 |
| Tender joint count 28 (N) | 53 | 0.0 | 0.0 | 2.0 |
| Swollen joint count 28 (N) | 53 | 0.0 | 0.0 | 1.0 |
| VAS patient global (mm) | 54 | 30.0 | 70.0 | 62.5 |
| ESR (mm/h) | 43 | 17.0 | 6.5 | 38.0 |
| CRP (mg/L) | 51 | 5.0 | 5.0 | 11.0 |
| DAS28 (CRP) | 42 | 3.1 | 2.4 | 4.3 |
| n | % | |||
| Female | 30/54 | 55.6 | ||
| RF (positive) | 12/50 | 24.0 | ||
| ACPA (positive) | 4/50 | 8.0 | ||
| Non-IRD patients | ||||
| N | Mdn | IQR 25% | IQR 75% | |
| Age (years) | 110 | 50.0 | 39.0 | 58.0 |
| Tender joint count 28 (N) | 110 | 0.0 | 0.0 | 0.0 |
| Swollen joint count 28 (N) | 110 | 0.0 | 0.0 | 0.0 |
| VAS patient global (mm) | 110 | 50.0 | 20.0 | 60.0 |
| ESR (mm/h) | 101 | 8.0 | 4.0 | 12.0 |
| CRP (mg/L) | 108 | 5.0 | 5.0 | 5.0 |
| DAS28 (CRP) | 101 | 2.2 | 1.7 | 2.7 |
| n | % | |||
| Female | 83/110 | 75.5 | ||
| RF (positive) | 11/103 | 10.7 | ||
| ACPA (positive) | 3 / 92 | 3.3 | ||
Annotation: Mdn, median; IQR 25%, interquartile range (25% bound); IQR 75%, interquartile range (75% bound)