Edited by Pfaff DW & Joels M and published by the Academic Press, the key features of the book include;
The citation refers to the 2015 study as: "...but the sample was relatively small and the percentage of homosexuality in the sample population was 2%, lower than in the general population (Sabuncuoglu, 2015)." However, that reasoning falls quite short, as a clinical sample of children and adolescents is unlikely to be similar to general population of mostly adult people. For instance, the ADHD percentage in a child psychiatry clinical population may be up to 40%, whereas it is expected to be about 5% in general child population, and 2-3% in general adult population. While some neurodevelopmental disorders fade with age, some of them increase when minors grow up.