Characteristics of the three Swedish cohorts of patients with RA
| Rheumatoid arthritis cohorts* | |||
|---|---|---|---|
| Inpatient Register | Early Arthritis | TNF antagonist | |
| Numbers indicate number of patients in each cohort unless otherwise specified. | |||
| *In the Early Arthritis cohort, values (means) refer to status at 6 months after diagnosis of RA. In the anti-TNF cohort, values refer to status at the start of anti-TNF treatment. | |||
| DAS28, 28 joint count Disease Activity Score; HAQ, Health Assessment Questionnaire. | |||
| Overall | 53067 | 3703 | 4160 |
| Men | 15185 | 1114 | 1048 |
| Women | 37882 | 2589 | 3112 |
| Age at start of follow up (years) | |||
| 16–44 | 4666 | 782 | 950 |
| 45–74 | 29900 | 2421 | 2986 |
| 75+ | 18501 | 500 | 224 |
| Calendar period of entry into cohort | |||
| 1964–1979 | 6932 | 0 | 0 |
| 1980–1989 | 11867 | 0 | 0 |
| 1990–1998 | 20898 | 1176 | 11 |
| 1999–2001 | 7667 | 1478 | 2398 |
| 2002–2003 | 5703 | 1049 | 1751 |
| Mean (min-max) follow up (years) | 5.6 (0–13) | 3.6 (0–8) | 2.3 (0–4) |
| Person-years | 297102 | 13292 | 9715 |
| DAS28* | – | mean 3.5, median 3.5 | mean 5.5, median 5.6 |
| HAQ* | – | mean 0.6, median 0.7 | mean 1.4, median 1.4 |