Height (cm) according to age in trans girls (A) and trans boys (B) and expressed as SDS according to days from initiation of sex steroids in trans girls (C) and trans boys (d), using Danish reference growth curves for the sex assigned at birth. Height measurements before hormone therapy (yellow), during gonadotropin-releasing hormone agonist treatment (blue), and during sex steroid treatment: estradiol or testosterone (red). Grey lines represent Danish reference ranges for the sex assigned at birth (mean, ± 1 SD and ±2 SD) (28).

Abbreviations: SDS, SD score.