Table 1 Characteristics of patients with rheumatoid arthritis - combined or by group - at baseline

Age (years), mean ± SD

51.9 ± 15.4

58.6 ± 15.8

47.7 ± 13.8

Sex (female:male)

22:5

7:3

15:2

 Hispanic or Latino

25

10

15

 Native Hawaiian or other Pacific Islanders

1

0

1

 African American

1

0

I

Disease duration (years), mean ± SD

6.5 ± 5.4

7.1 ± 5.2

5.7 ± 5.6

Body mass index (kg/m²), mean ± SD

28.3 ± 7.1

24.5 ± 5.5

30.1 ± 7.6

Seropositivity of rheumatoid factor

14

3

11

 Anti-CCP antibody

19

7

12

Cumulative prednisone dose (mg)

4.5 ± 3.8

1.4 ± 2.2

4.9 ± 3.6