Demographic, disease activity score, health assessment questionnaire score, smoking, and rheumatoid factor data on all patients and controls who completed the smoking questionnaire
| Cases (RN) | Controls | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| All (n = 64) | Male (n = 34) | Female (n = 30) | All (n = 146) | Male (n = 74) | Female (n = 72) | |||||||
| Values are n (%) or mean (SD). | ||||||||||||
| DAS28, 28 joint disease activity score; HAQ, Health Assessment Questionnaire; RA, rheumatoid arthritis; RF+, rheumatoid factor positive; RN, rheumatoid nodules. | ||||||||||||
| Ever smoked (n = 141) | 55 (86%) | 31 (91%) | 24 (80%) | 86 (59%) | 51 (69%) | 35 (49%) | ||||||
| Smoker (n = 70) | 25 | 13 | 12 | 45 | 21 | 24 | ||||||
| Former smoker (n = 71) | 30 | 18 | 12 | 41 | 30 | 11 | ||||||
| Never smoked (n = 69) | 9 (14%) | 3 (9%) | 6 (20%) | 60 (41%) | 23 (31%) | 37 (51%) | ||||||
| Age (years) | 56 (12) | 58 (10) | 55 (12) | 56 (12) | 56 (12) | 56 (13) | ||||||
| RA duration (months) | 6.8 (3.3) | 6.5 (3.4) | 7.2 (3.3) | 6.4 (3.0) | 6.0 (2.9) | 6.7 (3.2) | ||||||
| DAS28 | 5.44 (1.26) | 5.16 (1.24) | 5.74 (1.23) | 5.06 (1.37) | 4.87 (1.55) | 5.26 (1.11) | ||||||
| HAQ | 1.06 (0.63) | 0.98 (0.56) | 1.18 (0.68) | 0.87 (0.60) | 0.68 (0.52) | 1.09 (0.61) | ||||||
| RF+ | 50 (78%) | 26 (76%) | 24 (80%) | 93 (64%) | 50 (67%) | 43 (60%) | ||||||