Gender dysphoria in adolescent population: A 5-year replication study.

The aim of this study was to explore whether there has been an increase in prevalence and changes in sex ratio in feelings of gender dysphoria (GD) in an adolescent population in Northern Europe, and to study the impact of invalid responding on this topic. We replicated an earlier survey among junior high school students in Tampere, Finland. All first and second year students, aged 16-18, in the participating schools were invited to respond to an anonymous classroom survey on gender experience during the 2012-2013 school year and in the spring and autumn terms of 2017. Gender identity/GD was measured using the GIDYQ-A. A total of 318 male and 401 female youth participated in 2012-2013, and 326 male and 701 female youth in 2017. In the earlier survey, the GIDYQ-A scores, both among males and females, were strongly skewed toward a cis-gender experience with very narrow interquartile ranges. Of males, 2.2%, and of females, 0.5% nevertheless reported possibly clinically significant GD. The 2017 GIDYQ-A distribution was similarly skewed. The proportion of those reporting potentially clinically significant GD was 3.6% among males and 2.3% among females. Validity screening proved to have a considerable impact on conclusions. GD seems to have increased in prevalence in the adolescent population.