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Development, validity, and reliability of the Japanese version of the 7C of vaccination readiness scale

      Highlights

      • The Japanese version of 7C of the vaccination readiness scale was developed.
      • The validity and reliability of the Japanese scale was assessed.
      • The Japanese version of the scale showed acceptable validity and reliability.

      Abstract

      Background

      The 7C of vaccination readiness scale measures the seven psychological components that structure people's vaccination readiness. We aimed to develop the Japanese version of this scale (7C scale Japanese version) and to assess its validity and reliability.

      Methods

      The full and short versions of 7C scale Japanese were developed based on translation guidelines provided by the ISPOR Task Force. An Internet survey, including 709 participants, was performed to assess the scale's validity and reliability within a confirmatory factor analysis (CFA) framework (men: 38.8%, age range: 20–92 years). Invariance analysis using multiple-group CFA was conducted to test cross-cultural validity between participants in this study and those in the 7C original version study. McDonald's omega and intraclass correlation coefficient were calculated to evaluate internal consistency and test-retest reliability, respectively. To clarify the criterion validity, regression analysis, with previous COVID-19 vaccination status as the dependent variable, was performed to calculate pseudo R2.

      Results

      The 7C scale Japanese version exhibited good content validity, structural validity, configural invariance, and criterion validity. The results showed good internal consistency, and test-retest reliability, except for the “calculation” component.

      Conclusions

      7C scale Japanese version exhibited acceptable reliability and validity; however, “calculation” may be a less reliable subscale.

      Keywords

      List of abbreviations:

      COVID-19 (Coronavirus disease 2019), 7C scale (The 7C of vaccination readiness scale), 7C scale Japanese version (Japanese version of the 7C of vaccination readiness scale), COSMIN (COnsensus-based Standards for the selection of health Measurement INstruments), 7C scale original version (Original version of the 7C of vaccination readiness scale), CFA (Confirmatory Factor Analysis), CFI (Comparative fit index), TLI (Tucker-Levis index), RMSEA (Root mean square error of approximation), SRMR (Standardized root mean square residual), MGCFA (Multiple-group Confirmatory Factor Analysis), ICC (Intraclass correlation coefficient)
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