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Objective: Investigating the validity and reliability of the Turkish versions of the obesity-specific
health-related quality of life perception scales for children and parents , Sizing Me Up/Sizing
Them Up (SMU/STU), was the aim of this study.
Materials and Methods: Sizing me up/sizing them up were translated into Turkish following
a standardized translation procedure. Test-retest reliability, internal consistency, discriminant
and convergent validity, as well as confirmatory factor analysis (CFA) were all assessed.
Results: Sizing me up /sizing them up had a total scale Cronbach’s alpha of 0.873, 0.872. In
the test-retest evaluations, significant correlation was found in the SMU (except the Teasing/
Marginalization subscale), while no correlation was found in the Physical Functioning, Teasing/
Marginalization, School and Mealtime Difficulties subscales in the STU. The Pediatric Quality
of Life Generic Core Scales (PedsQL) total mean score and the SMU/STU total mean scores
exhibited a significant correlation (r= 0.671, P < .0001/r = 0.663, P < .001). Regarding the SMU
total scale score and other subscale scores, excluding the Social Avoidance subscale, and the
STU total scale score and other subscale scores, excluding Mealtime and School Functioning,
a significant difference was found between the OB and non-OB samples. In CFA, the com-
parative fit index (CFI) and root mean square error of approximation (RMSEA) values were not
compatible with the expected values.
Conclusion: The results demonstrated that both scales are suitable for use in the Turkish context and showed the validity and reliability of the Turkish versions of the SMU/STU; however, some inconsistencies were found in the items related to social avoidance in the SMU scale and positive social attributes, mealtime challenges, and school functioning in the STU, so it is recommended that these items should be interpreted separately and carefully when evaluating scale scores by researchers or clinicians
Cite this article as: Kızılay DÖ, Tepe D, Ersoy B, Sapmaz ŞY. Reliability and validity of the Turkish version of a self-reported sizing me up and a parent-proxy sizing them up: Obesity specific health-related quality of life measures. Turk Arch Pediatr. 2025;60(3):334-340.