Reliability and validity of revised and short form versions of diabetes diet-related quality of life scale

Eiko Sato, Ryota Ochiai, Taiga Shibayama, Masakazu Nishigaki, Yoshiki Abe, Tasuku Sawa, Yoshimi Suzukamo, Keiko Kazuma

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Objective: To develop both a revised version of the Diabetes Diet-Related Quality of Life (DDRQOL-R) scale that can be applied to patients with nephropathy and a short form of the DDRQOL-R. Method: A total of 184 outpatients with type 2 diabetes were asked to complete the self-administered DDRQOL-R scale to confirm its psychometric properties. A short-form version was developed, based on two methods: the result of the developed DDRQOL-R scale and consensus using the Delphi method among medical experts. Results: Correlations were generally strong between the DDRQOL-R factors extracted by factor analysis and each SF-36 subscale. Cronbach’s α coefficients were at least 0.7, and intraclass correlation coefficients were between 0.59 and 0.78. The nine items that showed high factor loadings were also assessed as important by the medical experts and were selected for the short form of the scale. The reliability and validity of the short form were found to be similar to those of the DDRQOL-R scale. Discussion: Our findings indicate that the DDRQOL-R scale and its short form have acceptable reliability and validity. The revised version is highly versatile, and the short form can be conveniently administered.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalDiabetology International
Issue number2
Publication statusPublished - 2017 Jun 1


  • Diabetes
  • Diet therapy
  • Diet-related quality of life
  • Scale development


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