Table 1

 Characteristics of the three Swedish cohorts of patients with RA

Rheumatoid arthritis cohorts*
Inpatient RegisterEarly ArthritisTNF 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.
Age at start of follow up (years)
Calendar period of entry into cohort
Mean (min-max) follow up (years)5.6 (0–13)3.6 (0–8)2.3 (0–4)
DAS28*mean 3.5, median 3.5mean 5.5, median 5.6
HAQ*mean 0.6, median 0.7mean 1.4, median 1.4