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Title: 0377 - Intra- and Inter-examiner Reproducibility in Irregularity Index Measurements

Authors:

Fatma Demir, Izmir Katip Celebi University
Ersat Irezli, Izmir Katip Celebi University
Mucahid Sahin, Izmir Katip Celebi University
ASLI BAYSAL (Presenter)
Izmir Katip Celebi University

Abstract:

Objectives: The aim of this study was to assess intra-examiner and inter-examiner reproducibility of irregularity index measurement.

Methods: Twenty plaster casts of moderately crowded arches were randomly selected and five contact point displacements (CPD) at lower anterior segment (through #33 to #34) was recorded using digital calipers on two different time points by three examiners to determine irregularity index (sum of five CPDs).
To evaluate intra- and inter- examiner differences, paired t-test and analyses of variance were used, respectively. Correlation analysis were performed between examiner pairs, the corresponding intraclass correlation coefficients (ICC) and associated significance determined. Statistical significance was set at p ≤ .05.

Results: Only a few of the repeated measurements of examiners showed significant differences (p ≤ .05). All researchers were consistent in repeated measurements (p=.000) and ICCs ranged between 0.916-0.986 Just for one CPD measurement, statistically significant difference was detected among examiners (p=.011). High correlation was found for inter-examiner repeatability (p<.05) and ICCs ranged between 0.739-0.984. But when the difference of 1.5 mm among measurements was set as clinically significant, the percentages of these values were 15%, 5% and 45% for examiner 1, 2 and 3, respectively. These were 25%, 80%, 65% for examiner pairs.

Conclusions: Irregularity index may be a misleading tool for determination of anterior alignment especially when measuring small contact point displacements.

Student Presenter

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE

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