Diversity between and within sex and gender
| Chromosomal sex | Physiological sex | Gender identity | Sexual orientation | Social identity |
|---|---|---|---|---|
| 1 in 400 pregnancies have an abnormal no. of X and Y chromosomes10 | Approximately 1.7% of live births have ambiguous external genitalia11 | Approximately 1 in 200 (0.5%) people aged 18–64 years identify as transgender in the USA12 | Across the USA, UK, Australia, Canada and Norway, the percentage of adults who self-identify as lesbian, homosexual or bisexual ranges from 1.2% in Norway to 5.6% in the USA13 | 2.6%–6% of boys and 5%–12% of girls frequently display cross-gender behaviour14* |
*Studies reviewed were of primary school-aged children in Canada and the Netherlands.