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Table 2 Characteristics in 53 participants according to historic fulfilment of the American College of Rheumatology 1987 criteria

From: Low-field magnetic resonance imaging or combined ultrasonography and anti-cyclic citrullinated peptide antibody improve correct classification of individuals as established rheumatoid arthritis: results of a population-based, cross-sectional study

  Rheumatoid arthritis (n = 20) Not rheumatoid arthritis (n = 33) P-value
Female, n (%) 14 (70) 16 (49) .178
Age, years 72 (30-79) 59 (31-82) .008
Symptom duration, years§ 15 (2-32) 11 (1-53) .369
Swollen joint count (40 joints) 4.5 (0-10) 0 (0-6) .000
Tender joint count (40 joints) 10 (0-40) 3 (0-28) .006
Current treatment with DMARDs, n (%) 16 (80) 0 (0) .000
CRP, mg/l 5.5 (0-33) 3 (1-14) .050
ESR, mm/hour 17 (2-53) 5 (1-28) .000
Positive RF (>8 IE/ml), n (%) 13 (65) 1 (3) .000
Positive ACPA (≥10 AU/l), n (%) 12 (60) 0 (0) .000
Positive ACPA and RF, n (%) 11 (55) 0 (0) .000
SF-36, physical component score* 38 (21-60) 40 (16-57) .441
HAQ-DI* 0.5 (0-2.375) 0.25 (0-2.125) .049
DAS28 3.7 (1.8-5.0) NR NR
Radiography, erosive (32 joints, ≥1 joint with erosion), n (%) 12 (60) 2 (6) .000
Radiography, Larsen score 21.5 (0-80) 0 (0-13) .000
RAMRIS, erosion score (wrist)# 4 (0-125) 1 (0-6) .001
RAMRIS, erosion score (MCP-joints 2-5) 1 (0-8) 0 (0-4) .009
RAMRIS, bone marrow oedema score (wrist)# 2 (0-18) 0 (0-9) .002
RAMRIS, bone marrow oedema score (MCP joints 2-5) 0 (0-5) 0 (0-2) .025
RAMRIS, synovitis score (wrist)# 4 (1-9) 3 (1-6) .119
RAMRIS, synovitis score (MCP joints 2-5) 6 (1-8) 3 (0-6) .017
GS synovitis joint count (30 joints, score ≥2) 4.5 (0-19) 0 (0-6) .000
GS synovitis joint count (wrists) 1 (0-2) 0 (0-1) .001
PD joint count (30 joints; score ≥2) 1 (0-14) 0 (0-2) .000
PD joint count (wrists) 0 (0-2) 0 (0-1) .001
US erosive joint count (30 joints, score ≥2) 10.5 (0-23) 1 (0-10) .000
US erosive joint count (wrists) 0.5 (0-2) 0 (0-1) .000
US erosive (32 joints; ≥1 joint with erosion), n (%) 19 (95) 31 (94) .871
  1. Values are median (range), unless otherwise stated. Mann-Whitney U test for continuous variables; χ2 test for proportions. §Rheumatoid arthritis, n = 19; not rheumatoid arthritis, n = 32. *Not rheumatoid arthritis, n = 32. #Rheumatoid arthritis, n = 18, not rheumatoid arthritis n = 32. Rheumatoid arthritis, n = 13; not rheumatoid arthritis, n = 18. ACPA, anti-cyclic citrullinated peptide antibody; CRP, C-reactive protein; DAS28, disease activity score in 28 joints using CRP; DMARDs, disease-modifying antirheumatic drugs; ESR, erythrocyte sedimentation rate; GS, grey-scale; HAQ-DI, Health Assessment Questionnaire-Disability Index; MCP, metacarpophalangeal; NR, not relevant; PD, Power Doppler; RAMRIS, Rheumatoid Arthritis Magnetic Resonance Imaging scoring System; RF, IgM rheumatoid factor; SF-36, Medical Outcomes Study Short Form (36 items); US, ultrasonography.