Table 1 Baseline demographics and disease characteristics

Mean age (years)

52.1

51.4

51.7

52.2

51.8

Age group, n (%)

   < 65 years

185 (91.1)

171 (83.8)

176 (86.7)

184 (90.6)

531 (87.0)

   ≥65 years

18 (8.9)

33 (16.2)

27 (13.3)

19 (9.4)

79 (13.0)

Female, n (%)

158 (77.8)

155 (76.0)

163 (80.3)

160 (78.8)

478 (78.4)

Ethnicity, n (%)

   White

168 (82.8)

169 (82.8)

177 (87.2)

179 (88.2)

525 (86.1)

   Hispanic

27 (13.3)

24 (11.8)

18 (8.9)

17 (8.4)

59 (9.7)

   Other^a

8 (3.9)

11 (5.4)

8 (3.9)

7 (3.4)

26 (4.3)

Mean weight (kg)

76.4

77.2

74.2

75.0

75.4

Mean height (cm)

164.0

164.6

164.0

164.8

164.5

Mean body mass index (kg/m²)

28.4

28.4

27.5

27.5

27.8

Mean duration of RA (years)

7.6

7.3

7.5

8.0

7.6

Subcomponent of ACR (mean)

   Tender joint count

26.3

26.5

24.8

26.9

26.1

   Swollen joint count

16.8

16.8

15.8

15.7

16.1

   Patient global assessment

5.9

6.2

6.1

6.1

6.2

   Physician global assessment

6.2

6.3

6.3

6.5

6.4

   Patient pain assessment

51.2

53.9

53.5

57.0

54.8

HAQ Disability Index

1.4

1.5

1.5

1.5

1.5

C-reactive protein (mg/dl)

1.2

1.8

1.5

1.4

1.6

ESR (mm/hour)

33.4

40.1

35.6

35.5

37.1

Mean DAS28 CRP

4.7

4.9

4.7

4.8

4.8

Mean DAS28 ESR

5.3

5.4

5.3

5.4

5.3

Mean tender joint count (28 joints)

14.0

14.5

13.5

14.0

14.0

Mean swollen joint count (28 joints)

11.3

10.6

10.8

11.2

11.0