The prevalence of intersex traits varies depending on the definition used. According to the American Journal of Human Biology, intersex is around 1.7% of all live births. However, this figure includes conditions that most clinicians do not recognize as intersex, such as Klinefelter syndrome, Turner syndrome, and late-onset adrenal hyperplasia. If the term intersex is restricted to those conditions in which chromosomal sex is inconsistent with phenotypic sex, or in which the phenotype is not classifiable as either male or female, the true prevalence of intersex is seen to be about 0.018%, almost 100 times lower than the 1.7% estimate.
It is important to note that collecting data on intersex people is complicated by multiple factors, and genetic differences vary in different populations. Therefore, the frequency of intersex traits is not uniform throughout the world. Despite the limitations of the data, experts estimate that up to 1.7% of the population are born with intersex traits.
In summary, the prevalence of intersex traits varies depending on the definition used, but the most precise estimate is around 0.018% of the population.
