Between a boy and a girl: Measuring gender identity on a continuum.

Studies of gender development typically use binary, discrete measures of identity. However, growing literature indicates that some children might not identify with a binary gender. We tested a continuous measure of felt gender identity with gender-nonconforming children, socially-transitioned transgender children, cisgender siblings, and unrelated cisgender children. In two studies, we found that transgender and cisgender children did not differ in their degree of identifying as their current gender, that they showed more binary identities compared to gender-nonconforming children, and that the continuum was a valid predictor of other measures of gender development. We also found that children's use of the continuous measure was stable over time. Our results demonstrate the test-retest reliability and validity of a new single-item continuous measure of gender.