| Early RA | Established RA |
| 1 subject missing race/ethnicity | 2 subjects missing race/ethnicity |
| 2 subjects declined to answer education | 3 subjects declined to answer education |
| 5 subjects declined to answer income | 11 subjects declined to answer income |
| 5 subjects missing shared epitope | 1 subject missing ever smoker |
| 1 subject missing current smoker | |
| 4 subjects missing shared epitope |
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