Table S1.
The blood test results of IgM RF and ACPA among confirmed ICD-10 M05 (seropositive) RA diagnoses in the Danish National Patient Registry in the period 1977–2016 among the participants in the Danish Diet, Cancer, and Health cohort and derived from the Central Denmark Region hospitals
| Confirmed ICD-10 M05 diagnoses, n=108 | IgM RFa | ||||
|---|---|---|---|---|---|
| ACPAa | Positive, % (n) | Negative, % (n) | Not available, % (n) | Overall, % (n) | |
| Positive, % (n) | 25 (27) | 0 | 0 | 25 (27) | |
| Negative, % (n) | 4.6 (5) | 0.9 (1) | 0 | 5.6 (6) | |
| Not available, % (n) | 56.5 (61) | 6.5 (7) | 6.5 (7) | 69.4 (75) | |
| Overall, % (n) | 86.1 (93) | 7.4 (8) | 6.5 (7) | 100 (108) | |
Notes:
a
Blood test results before, at or within 1 month after the first-time registration in the Danish National Patient Registry.
Abbreviations: ACPA, anti-citrullinated protein antibody; ICD, International Classification of Diseases; IgM RF, immunoglobulin M rheumatoid factor; RA, rheumatoid arthritis.