Table 2.
Initial Tests in Incident Cases of Both Cohorts
| Initial Laboratory and Radiographic Tests | Specialized CoE | National RA Registry | P-value | ||
|---|---|---|---|---|---|
| (n=303) | (n=4766) | ||||
| n | % | n | % | ||
| ESR | |||||
| Normal (≤ 20) | 105 | 34.65 | 1344 | 28.20 | 0.159 |
| Elevated (21–150) | 163 | 53.80 | 1596 | 33.49 | <0.001 |
| No data | 35 | 11.55 | 1826 | 38.31 | 0.001 |
| Rheumatoid factor | |||||
| Negative | 64 | 21.12 | 893 | 18.74 | 0.638 |
| Positive | 215 | 70.96 | 2616 | 54.89 | <0.001 |
| No data | 24 | 7.92 | 1257 | 26.37 | 0.041 |
| Anti-CCP | |||||
| Negative | 77 | 25.41 | 715 | 15.00 | 0.017 |
| Positive | 197 | 65.02 | 1343 | 28.18 | <0.001 |
| No data | 29 | 9.57 | 2708 | 56.82 | <0.001 |
| Hand X-ray | |||||
| No erosions | 141 | 46.53 | 1275 | 26.75 | <0.001 |
| With erosions | 59 | 19.47 | 234 | 4.91 | 0.0002 |
| No data | 103 | 33.99 | 3257 | 68.34 | <0.001 |
| Foot X-ray | |||||
| No erosions | 138 | 45.54 | 858 | 18.00 | <0.001 |
| With erosions | 30 | 9.90 | 132 | 2.77 | 0.075 |
| No data | 135 | 44.55 | 3776 | 79.23 | <0.001 |
Note: P value pearson’s chi-square test.
Abbreviations: CoE, Center of Excellence; RA, rheumatoid arthritis; ESR, erythrocyte sedimentation rate; Anti-CCP, Anti-cyclic citrullinated peptides antibodies.