The curves indicate the central limits of 95% upper and lower ICC probability distributions (1) as functions of the ICC population, with Model 1. The number of measurements is everywhere k- 3, while the number of subjects is between 10 and 100. Read horizontally, the diagram contains the confidence limits of 95% of the ICC population for a particular example ICC (1) value. If z.B No. 10 and the ICC sample (1) is 0.70, the confidence limits of the ICC population are graphically read at about 0.38 and 0.91. The diagram also applies to CCIs (C,1), i.e. ICC consistency with Model 2 and Model 3. Because the intraclass correlation coefficient provides a combination of intra-observable and inter-observative variability, its results are sometimes considered difficult to interpret when observers are not interchangeable. Other measures such as Cohen`s kappa statistics, Fleiss-Kappa and correlation coefficient have been proposed as more appropriate compliance measures among non-interchangeable observers.
The Intraclass Correlation Coefficient (ICC) can be used to measure the strength of the Inter-Rater agreement in a situation where the evaluation scale is continuous or ordinal. It is suitable for studies with two or more tips. Note that CCI can also be used for test reliability analysis (repeated measurements of the same subject) and intra-rater (several points from the same tips). You`ll find the IC definitions For consistency and consistency in the article below, which is an excellent (and probably essential) resource for understanding the ICC output of SPSS. McGraw, K.O., Wong, S.P. (1996a). Findings on certain intracelerular correlation coefficients. Psychological methods, 1, 30-46. A clinical researcher has developed a new ultrasonographic method to quantify skoliotic deformation. Before using the new method for his routine clinical practice, he conducted a reliability study to assess the reliability of the test.
He recruited 35 patients with scoliosis with a variety of malformations in a children`s hospital and used his new method to measure their liotic deformity. The measurements were repeated three times for each patient. He analyzed his data using a moderate, absolute, two-way mixed effects model and reported his ICC results in a specialized journal as CCI -0.78 with a confidence interval of 95% – 0.72-0.84.