Clinical Study
Validation of a Prediction Rule for the Diagnosis of Rheumatoid Arthritis in Patients with Recent Onset Undifferentiated Arthritis
Table 1
General characteristic of total population and by sex.
| | Characteristic | Total () | Females (; 74 %) | Males (; 26 %) | value (females versus males) |
| | Age, mean (SD) | 55.6 (17.4) | 54.6 (18.1) | 58.5 (15) | 0.3459 | | Smoking status, (%) | | | | | | Never smoked | 61 (69.3) | 49 (75.4) | (52.2) | | | Smoked in the past | (21.6) | 9 (13.8) | (43.4) | 0.011 | | Still smoking | (9.1) | 7 (10.8) | (4.4) | | | HAQ, mean (SD) | 1.1 (1.2) | 1.2 (1.3) | 0.9 (0.6) | 0.3418 | | Number of tender joints, mean (SD) | 6.8 (5) | 6.6 (4.6) | 7.4 (6.2) | 0.4800 | | Number of swollen joints, mean (SD) | 5.5 (4.2) | 5.3 (3.8) | 6.1 (5.1) | 0.4089 | | Disease duration, (months) mean (SD) | 3.6 (4.3) | 3.9 (4.8) | 2.9 (2.1) | 0.3118 | | VAS pain, (mm) mean (SD) | 59.9 (26.5) | 58.9 (26.5) | 62.7 (18.1) | 0.5245 | | VAS patients global, (mm) mean (SD) | 56.5 (25.6) | 55.5 (26.6) | 59.3 (23.1) | 0.5427 | | VAS physician global, (mm) mean (SD) | 41.6 (21.5) | 41.3 (22.4) | 42.4 (19.6) | 0.8292 | | VAS morning stiffness, (mm) mean (SD) | 49.8 (30.9) | 49.5 (31.5) | 50.5 (29.8) | 0.8875 | | ESR, mean (SD) | 36.9 (25) | 35 (22.8) | 42.3 (30.3) | 0.2193 | | PCR, mean (SD) | 15.7 (21.2) | 13.1 (20.9) | 21.8 (21) | 0.1222 | | Positive RF: (%) | 27 (30) | 21 (31) | 6 (25) | 0.559 | | Positive anti-CCP: (%) | 47 (51.6) | 38 (57) | 9 (37.5) | 0.106 | | DAS28 (SD) | 5.2 (1.2) | 5.1 (1.2) | 5.3 (1.2) | 0.6708 | |
van der Helm score, mean (SD) | 6.9 (2) | 7.1 (2.1) | 6.1 (1.8) | 0.0380 | | Mean ACR/EULAR criteria (SD) | 5.1 (2.1) | 5.1 (2.2) | 5.1 (2) | 0.9263 |
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SD: standard deviation; HAQ: Health Assessment Questionnaire, VAS: visual analogue scale; ESR: eritrosedimentation rate; PCR: C-reactive protein; DAS28: disease activities score 28 joints,; RF: rheumatoid factor; CCP: cyclic citrullinated peptide.
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