Table 1

 Characteristics of the three Swedish cohorts of patients with RA

Rheumatoid arthritis cohorts*
Inpatient RegisterEarly ArthritisTNF antagonist
*In the Early Arthritis cohort, values refer to status at 6 months after diagnosis of RA. In the TNF antagonist cohort, values refer to status at the start of anti-TNF treatment.
DAS28, 28 joint count Disease Activity Score; HAQ, Health Assessment Questionnaire.
Overall5306737034160
    Men1518511141048
    Women3788225893112
Age at start of follow up (years)
    16–444666782950
    45–742990024212986
    75+18501500224
Calendar period of entry into cohort
    1964–1979693200
    1980–19891186700
    1990–199820898117611
    1999–2001766714782398
    2002–2003570310491751
Person-years297102132929715
DAS28mean 3.5, median 3.5mean 5.5, median 5.6
HAQmean 0.6, median 0.7mean 1.4, median 1.4