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Table 1 Intra – observer variability between skilled and non-skilled US investigator in large and small joints.

From: Ultrasound measurement of joint cartilage thickness in large and small joints in healthy children: a clinical pilot study assessing observer variability

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