Erschienen in:
01.04.2013 | Letter to the Editor
Reliability of shade selection using an intraoral spectrophotometer: common mistakes in reliability analysis
verfasst von:
S. Sabour, M. Moezizadeh, E. Vahid Dastjerdi
Erschienen in:
Clinical Oral Investigations
|
Ausgabe 3/2013
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Excerpt
We were interested to read the paper by Witkowski S and colleagues published in the June 2012 issue of
Clinical Oral Investigations. The authors’ aim was to evaluate the accuracy and reproducibility of human tooth shade selection using a digital spectrophotometer. They report the mean colour difference from the mean metric for measurement precision (reliability)! Also, least square test was used to assess inter- and intra-observer reliability [
1]. Why did the authors not use well-known statistical tests for reliability analysis such as intra-class correlation coefficient for quantitative variables, weighted kappa for qualitative ones [
2‐
5] or other methods such as coefficient of variance for repeatability [
2‐
5], considering that the mean of the variables and using paired
t test, least square test or correlation coefficient (
r) are among the common mistakes in reliability analysis [
2‐
5]? Regarding reliability or agreement, it is good to know that not only avoiding common mistakes in reliability analysis but also taking into account clinical importance instead of statistical significance is a crucial issue in clinical reliability researches [
2‐
5]. …
