Table 1

Intra – observer variability between skilled and non-skilled US investigator in large and small joints.

HIP

KNEE

ANKLE

MCP

PIP

Skilled Investigator

Mean Differences ± SD

(95% CI)¹

0.04 ± 0.14

(-0.02 – 0.09)

-0.04 ± 0.22

(-0.13 – 0.04)

-0.23 ± 0.35

(-0.32 – 0.14)

-0.004 ± 0.14

(0.22–0.38)

0.06 ± 0.13

(0.01 – 0.12)

Non-skilled Investigator

Mean Differences ± SD

(95% CI)

-0.03 ± 0.18

(-0.11 – 0.04)

-0.15 ± 0.75

(-0.47 – 0.16)

-0.06 ± 0.20

(-0.14 – 0.03)

0.013 ± 0.21

(-0.01 – 0.09)

0.06 ± 0.18

(-0.01 – 0.14)

¹Mean Differences in mm Cartilage Thickness – SD Standard deviation – 95% Confidence interval

Spannow et al. Pediatric Rheumatology 2007 5:3   doi:10.1186/1546-0096-5-3