Table 2

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

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


Radner et al. Arthritis Res Ther 2012 14:R61   doi:10.1186/ar3777

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