Test-Retest Reliability of Beurer Glass Diagnostic Scale for Measuring Body Mass Index

Abstract

Objective: The purpose of this study was to evaluate the test-retest reliability of beurer glass diagnostic scale for measuring body mass index (BMI).

Methods: A total of 80 healthy male subjects in the age group of 19–45 years were participated in this study. The age and height of each participant was added into the beurer glass diagnostic scale prior to the measurement of the BMI. Each participant was measured twice to establish test-retest reliability. To assess test-retest reliability, Intraclass Correlation Coefficient (ICC) and the Bland-Altman method was used. The level of significance was set at 5% (p<0.05).

Results: The ICC values were significant and showed excellent magnitude (0.98–0.99) and no significant differences were found between the means of 2 measurement (p>0.05). A strong positive correlation between BMI of glass scale and BMI calculation method (r=0.994) and BMI of glass scale and body weight (r=0.943) were noted.

Conclusions: The results suggest that the beurer glass diagnostic scale is a reliable instrument for assessing BMI.

Zusammenfassung

Ziel: Ziel dieser Studie war die Beurteilung der Retest-Reliabilität von Beurer Glas-Diagnosewaagen zur Messung des Body-Mass-Index (BMI).

Methoden: Insgesamt nahmen 80 männliche Probanden in der Altersgruppe von 19–45 Jahren an dieser Studie teil. Vor Messung des BMI wurden Alter und Körpergröße jedes Probanden in die Beurer Glas-Diagnosewaage eingegeben. Jeder Proband wurde 2-mal gemessen, um die Retest-Reliabilität festzustellen. Um die Retest-Reliabilität zu bewerten, wurden der Intraklassen-Korrelationskoeffizient (Intraclass Correlation Coefficient ICC) und die Bland-Altman-Methode angewendet. Das Signifikanzniveau wurde auf 5% (p<0,05) festgelegt.

Ergebnisse: Die ICC-Werte waren signifikant und zeigten ausgezeichnete Ergebnisse (0,98–0,99); es ergaben sich keine signifikanten Unterschiede zwischen den Mittelwerten zweier Messungen (p>0,05). Es wurde eine starke positive Korrelation zwischen dem BMI der Glas-Diagnosewaage und der BMI-Berechnungsmethode (r=0,994) sowie zwischen dem BMI der Glas-Diagnosewaage und dem Körpergewicht (r=0,943) festgestellt.

Schlusfolgerung: Die Ergebnisse lassen darauf schließen, dass die Beurer Glas-Diagnosewaage ein zuverlässiges Instrument ist, um den BMI zu berechnen.

Key words

body mass index - measurement - reliability

Schlüsselwörter

Body-Mass-Index - Messung - Reliabilität

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