Table 1 Demographic and clinical characteristics of the patients with rheumatoid arthritis

Total patients, n

402

81

42

597

100

567

Total sets of X-rays, n

637

210

173

3143

353

567

Female sex, n (%)

304 (75.62)

62 (76.54)

26 (61.90)

402 (67.3)

70 (70.0)

444 (78.3)

Age at diagnosis, yr, mean (SD)

57.09 (13.61)

55.39 (17.33)

53.11 (14.77)

57.1 (15.6)

49.1 (11.6)

48.7 (12.7)

Year at RA diagnosis, range

1976–2011

2000–2011

1992–2004

1993–2006

1963–1999

1980–1999

RF positivity, n (%)

260 (64.68)

47 (58.02)

35 (83.33)

342 (57.6)^a

–

–

ACPA positivity, n (%)

167 (47.18)^b

38 (47.50)^c

33 (78.57)

309 (52.8)^d

96 (97.0)^e

452 (79.7)

Radiographic follow-up, yr

15

5

10

7

15

NA