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Table 2 Intraclass correlation of different observer derived joint counts at baseline and follow up visit.

From: Value of self-performed joint counts in rheumatoid arthritis patients near remission

  Biometrician versus Patient Physician versus Patient
  Biometrician ICC (95% CI) Independent physician ICC (95% CI)
Patient derived Joint counts Baseline Follow-up Baseline Follow-up
TOTAL N = 209 N = 144 N = 209 N = 144
Swollen Joint Count 28 0.30 (0.18- 0.42) 0.38 (0.23-0.51) 0.35 (0.22-0.46) 0.43 (0.28-0.55)
Tender Joint Count 28 0.70 (0.62-0.76) 0.71 (0.62-0.79) 0.80 (0.74-0.84) 0.82 (0.76-0.87)
UNTRAINED PATIENTS N = 131 N = 87 N = 131 N = 87
Swollen Joint Count 28 0.32 (0.15-0.46) 0.33 (0.13-0.51) 0.39 (0.23-0.52) 0.41 (0.22-0.57)
Tender Joint Count 28 0.75 (0.66-0.81) 0.72 (0.60-0.81) 0.85 (0.80-0.90) 0.81 (0.72-0.87)
TRAINED PATIENTS N = 78 N = 57 N = 78 N = 57
Swollen Joint Count 28 0.35 (0.14-0.53) 0.50 (0.28-0.67) 0.33 (0.12-0.51) 0.48 (0.25-0.66)
Tender Joint Count 28 0.59 (0.42-0.72) 0.72 (0.56-0.82) 0.66 (0.51-0.77) 0.84 (0.74-0.90)
Physician derived Joint counts Baseline Follow-up   
Swollen Joint Count 28 0.95 (0.93-0.96) 0.90 (0.87-0.93) 1 1
Tender Joint Count28 0.86 (0.82-0.89) 0.89 (0.85-0.92) 1 1