The Reliability and Validity of the Subjective Diet-related Quality of Life (SDQOL) Scale among Japanese Adults

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  • Ainuki Tomomi
    Institute of Environmental Science for Human Life, Ochanomizu University Graduate School of Humanities and Sciences, Ochanomizu University
  • Akamatsu Rie
    Graduate School of Humanities and Sciences, Ochanomizu University
  • Hayashi Fumi
    Chiba Prefectural University of Health Sciences
  • Takemi Yukari
    Kagawa Nutrition University

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Other Title
  • 成人期における食に関する主観的QOL（subjective diet-related quality of life (SDQOL)）の信頼性と妥当性の検討
  • セイジンキ ニ オケル ショク ニ カンスル シュカンテキ QOL(subjective diet-related quality of life (SDQOL))ノ シンライセイ ト ダトウセイ ノ ケントウ

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Objective: To examine the reliability and validity of the Subjective Diet-Related Quality of Life (SDQOL) scale among Japanese adults.<br>Methods: Data (n = 2,936) from “Research about the present status of and consciousness about shokuiku,” a study conducted by the Cabinet Office between November and December 2009 (response rate: 58.7%) were used for the analysis. The sample consisted of 1,344 males (45.8%) and 1,592 females (54.2%). Cronbach's alpha was examined as an indicator of the internal reliability of the six items comprising the SDQOL scale, and data on construct and criterion-referenced validity confirmed the validity of the SDQOL scale. The associations between the entire SDQOL scale and measurements of household secure level and satisfaction with life were examined using Spearman's correlations (rs) via criterion-referenced validity.<br>Results: Exploratory and confirmatory factor analyses demonstrated that a model consisting of four items fitted the data (GFI = 0.99, AGFI = 0.96, CFI = 0.99, RMSEA = 0.08; 90% CI: 0.06~0.10). Cronbach's alpha was 0.72. The findings that scores on household secure level (rs = 0.16, p < 0.001) and satisfaction with life (rs = 0.38, p < 0.001) were correlated with higher scores on the SDQOL show the criterion-referenced validity of this instrument.<br>Conclusion: The reliability and the construct and criterion-referenced validity of the SDQOL scale were confirmed. Additional research should examine the association between the SDQOL scale and diet.

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