Table 2 Prevalence of smoking and autoantibodies in RA patients from three different early arthritis cohorts

RA patients, n

678

769

795

Ever smokers

432 (64)

415 (54)

471 (59)

Anti-CarP-positive

182 (27)

349 (45)

279 (35)

Anti-CCP2-positive

247 (36)

404 (53)

456 (57)

RF-positive

277 (41)

442 (58)

448 (56)

Anti-CCP2^–RF^–Anti-CarP^–

292 (43)

242 (32)

263 (33)

Anti-CCP2⁺RF^–Anti-CarP^–

51 (8)

20 (3)

45 (6)

Anti-CCP2^–RF⁺Anti-CarP^–

76 (11)

71 (9)

59 (7)

Anti-CCP2^–RF^–Anti-CarP⁺

40 (6)

38 (5)

6 (1)

Anti-CCP2⁺RF⁺Anti-CarP^–

73 (11)

87 (11)

149 (19)

Anti-CCP2⁺RF^–Anti-CarP⁺

15 (2)

27 (4)

33 (4)

Anti-CCP2^–RF⁺Anti-CarP⁺

20 (3)

14 (2)

11 (1)

Anti-CCP2⁺RF⁺Anti-CarP⁺

107 (16)

270 (35)

229 (29)