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Comparison of distribution of phenotypes in Caucasians and Hispanics
| Caucasians | Hispanics | |||
| Phenotypes | mean ± SD | median | mean ± SD | median |
| Age at onset (yr) | 39.35 ± 13.38 | 39 | 34.48 ± 12.42 | 35 |
| Anti-CCPa | 107.51 ± 79.44 | 111 | 120.20 ± 72.66 | 139 |
| RF-IgMa | 255.06 ± 568.52 | 77 | 319.10 ± 386.38 | 127.5 |
| Shared epitopes | 84.55% | 71.88% | ||
aSee Criswell et al. [9] for details on sample quantitation
