%0 Journal Article %T Gender diversity and non %A Jos Twist %A Nastasja M de Graaf %J Clinical Child Psychology and Psychiatry %@ 1461-7021 %D 2019 %R 10.1177/1359104518804311 %X There has been a recent rise in the number of people who hold a non-binary gender identity. However, the proportion of young people attending gender services who identify as non-binary has not yet been investigated. This article presents the findings from a pilot study of newly designed questionnaire, the Gender Diversity Questionnaire, which included questions about gender identity and gender expression. Responses from 251 adolescents attending the United Kingdom¡¯s National Gender Identity Development Service between June 2016 and February 2017 are reported here. The majority, 56.9%, of young people identified as trans, 29.3% identified as a binary gender (male or female), 11% identified as non-binary and 1.2% as agender. There were no significant differences in self-defined identities based on assigned gender or age. However, once young people were separated into these groups, some of them were very small; thus, a larger sample is required. In terms of aspects of gender expression that were important to the young people, the data formed five themes ¨C name and pronouns, external appearance, the body, intrinsic factors and ¡®other¡¯. Strengths and weaknesses of the research are discussed as well as future work that will be conducted %K Non-binary %K trans %K youth %K young people %K gender diverse %U https://journals.sagepub.com/doi/full/10.1177/1359104518804311