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Table 4 Agreements between US, MRI, and clinical examination for inflammatory changes

From: Ultrasonography, magnetic resonance imaging, radiography, and clinical assessment of inflammatory and destructive changes in fingers and toes of patients with psoriatic arthritis

  US1 versus US2 US versus MRI USa versus clinical examinationb MRIc versus clinical examinationb
Synovitis     
   MCP joint (total) 88%; κ = 0.305 83%; κ = 0.574 62%; κ = -0.033 63%; κ = 0.047
PsA 84%; κ = 0.280 80%; κ = 0.540 62%; κ = 0.047 64%; κ = 0.131
RA 100%; κ = NA 75%; κ = 0.519 63%; κ = -0.007 60%; κ = 0.091
CTRL 100%; κ = NA 100%; κ = NA 63%; κ = NA 100%; κ = NA
   PIP joint (total) 78%; κ = 0.361 78%; κ = 0.337 66%; κ = NA 66%; κ = 0.012
PsA 84%; κ = 0.367 73%; κ = 0.290 64%; κ = -0.053 68%; κ = 0.149
RA 50%; κ = 0.059 75%; κ = 0.375 63%; κ = 0.162 50%; κ = -0.190
CTRL 100%; κ = NA 95%; κ = NA 73%; κ = NA 95%; κ = NA
   DIP joint (total) 83%; κ = 0.129 87%; κ = 0.177 74%; κ = -0.020 79%; κ = -0.082
PsA 84%; κ = 0.120 78%; κ = 0.039 72%; κ = 0.041 68%; κ = -0.098
RA 100%; κ = NA 100%; κ = 1.000 83%; κ = -0.077 90%; κ = -0.053
CTRL 100%; κ = NA 100%; κ = NA 73%; κ = NA 100%; κ = NA
   MTP joint (total) 91%; κ = 0.825 - 51%; κ = -0.063 -
PsA 90%; κ = 0.799 - 55%; κ = -0.038 -
RA 100%; κ = 1.000 - 52%; κ = -0.034 -
CTRL 90%; κ = 0.783 - 38%; κ = NA -
Tenosynovitis     
   MCP joint (total) 93%; κ = -0.034 91%; κ = 0.484 - -
PsA 91%; κ = -0.048 90%; κ = 0.227 - -
RA 100%; κ = NA 85%; κ = 0.625 - -
CTRL 100%; κ = NA 100%; κ = NA - -
   PIP joint (total) 87%; κ = -0.029 96%; κ = 0.645 - -
PsA 89%; κ = -0.035 87%; κ = 0.380 - -
RA 63%; κ = NA 75%; κ = 0.468 - -
CTRL 100%; κ = NA 100%; κ = NA - -
   DIP joint (total) 97%; κ = NA 96%; κ = 0.645 - -
PsA 98%; κ = NA 98%; κ = 0.659 - -
RA 88%; κ = NA 85%; κ = 0.571 - -
CTRL 100%; κ = NA 100%; κ = NA - -
Insertional changes     
   Extensor tendons (total) 88%; κ = NA 94%; κ = 0.370 - -
PsA 83%; κ = NA 92%; κ = 0.400 - -
RA 100%; κ = NA 95%; κ = NA - -
CTRL 100%; κ = NA 100%; κ = NA - -
   Flexor tendons (total) 98%; κ = NA 95%; κ = 0.593 - -
PsA 98%; κ = NA 97%; κ = NA - -
RA 100%; κ = NA 85%; κ = 0.634 - -
CTRL 100%; κ = NA 100%; κ = NA - -
Capsular/extra-capsular changes     
   Total 86%; κ = NA 87%; κ = 0.511 - -
PsA 83%; κ = NA 88%; κ = 0.410 - -
RA 88%; κ = NA 90%; κ = 0.692 - -
CTRL 100%; κ = NA 100%; κ = NA - -
  1. aUltrasonography (US) synovitis (synovial hypertrophy and/or effusion, and/or power Doppler signal); bclinically tender and swollen joints; cmagnetic resonance imaging (MRI) synovitis. Values are absolute agreement presented as a percentage. The imaging modalities were US, MRI, and clinical examination. The interobserver substudy was performed by ultrasonographer 1 (Charlotte Wiell = US1) and ultrasonographer 2 (Marcin Szkudlarek = US2). A hyphen (-) indicates that the measurement was not performed. κ, kappa value; CTRL, healthy control person; DIP, distal interphalangeal; MCP, metacarpophalangeal; MTP, metatarsophalangeal; NA, not applicable; PIP, proximal interphalangeal; PsA, psoriasis-associated arthritis; RA, rheumatoid arthritis.