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Weight Bias Internalization Scale: Psychometric properties using alternative weight status classification approaches.

Morgan S Lee1, Robert F Dedrick1

  • 1University of South Florida, Tampa, FL, United States.

Body Image
|February 25, 2016
PubMed
Summary

This study validated the Weight Bias Internalization Scale (WBIS) for use with overweight and obese individuals. The modified 10-item scale demonstrated acceptable psychometric properties for both self-perceived and BMI-based weight status groupings.

Keywords:
Confirmatory factor analysisInternalized weight biasObesity stigmaPsychometricsWeight Bias Internalization Scale

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Area of Science:

  • Psychology
  • Health Psychology
  • Psychometrics

Background:

  • Internalized weight bias is a significant concern in overweight and obese populations.
  • The Weight Bias Internalization Scale (WBIS) is a key tool for research, but its English version requires psychometric validation.
  • Understanding weight status through self-perception versus Body Mass Index (BMI) may impact scale applicability.

Purpose of the Study:

  • To conduct confirmatory factor analysis (CFA) on the English version of the WBIS.
  • To assess the psychometric properties of the WBIS when participants are grouped by self-perceived weight status versus BMI-defined weight status.
  • To evaluate the reliability and validity of a modified WBIS for research on internalized weight bias.

Main Methods:

  • The study involved 243 undergraduate students classified as overweight/obese by self-perception or BMI.
  • Confirmatory factor analysis (CFA) was performed on a modified 10-item WBIS after excluding one item.
  • Internal consistency was assessed using Cronbach's alpha for both grouping methods.

Main Results:

  • After excluding Item 1, the modified 10-item WBIS showed high internal consistency (Cronbach's alpha = .92 for perception-based, .94 for BMI-based).
  • Confirmatory factor analysis indicated acceptable model fit for a one-factor structure in both participant groupings.
  • The psychometric properties of the modified WBIS were found to be similar regardless of whether weight status was determined by self-perception or BMI.

Conclusions:

  • The modified 10-item WBIS demonstrates acceptable psychometric properties for research on internalized weight bias.
  • The scale is suitable for use with overweight/obese individuals, irrespective of whether weight status is defined by self-perception or BMI.
  • This validation supports the systematic investigation of weight bias internalization across different weight status classifications.