Table 1.
Summary of cohort characteristicsa
| Cohort | No. of patients | No. (%) femaleb | Criteria for diagnosis | Anti‐CCP–negative, % |
|---|---|---|---|---|
| BRAGGSS | 296 | 225 (78) | 1987 ACR criteria for RA | 100 |
| NR | 24 | 23 (96) | 1987 ACR criteria for RA | 100 |
| RAMS | 119 | 80 (67) | 1987 ACR criteria for RA | 100 |
| NOAR | 585 | 369 (67) | 1987 ACR criteria for RA | 100 |
| Total | 1,024 | – | – | – |
a
Anti‐CCP = anti–cyclic citrullinated peptide; BRAGGSS = Biologics in Rheumatoid Arthritis Genetics and Genomics Study Syndicate; ACR = American College of Rheumatology; RA = rheumatoid arthritis; NR =National Repository; RAMS = Rheumatoid Arthritis Medication Study; NOAR = Norfolk Arthritis Register.
b
Percentage of the individuals for whom information on sex was available.