Question 2: What is meant by ‘the intraclass correlation coefficient was 0.82’ and what can we conclude?
The intraclass correlation coefficient is a measure of the repeatability of a measurement. It is the correlation between repeated measurements of the same thing. The order in which measurements were made is ignored. It is an average correlation over all possible orders of the measurements. It is the ratio of the variance between subjects' true values to the variance of the actual measurements. Hence ICC = 0.82 enables us to conclude that 82% of the variance in measured femur length is due to variation between femurs and 18% is due to measurement error.
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