Reliability and Validity of the Japanese Version of the Genderqueer Identity Scale

In recent years, the concept of the gender spectrum, which moves beyond the binary view of gender identity, has been proposed, drawing the attention of the Japanese to the existence of nonbinary and genderqueer individuals (NBGQ). However, NBGQ identities are often encompassed within LGBTQ discussions, and research or scales specifically focusing on NBGQ individuals remain scarce in Japan. This study aimed to develop a Japanese version of the Genderqueer Identity (GQI) scale originally developed by McGuire et al., referred to as the GQI-Japanese version (GQI-J), and to evaluate its reliability and construct validity. This study comprised 203 individuals aged 18-29 (mean, 20.90 ± 2.05) years. This included 56 participants assigned male at birth and 147 assigned female at birth. The participants were instructed to complete a questionnaire that included the GQI-J and items assessing their tendencies toward gender dysphoria. The results demonstrated that the GQI-J comprised 18 items with three core subscales and one independent subscale (Gender Fluidity), confirming its reliability and construct validity. The GQI-J is expected to facilitate quantitative research in Japan on individuals who do not conform to the binary gender framework, supporting the development of psychological support tailored to their needs.