Association patterns between 2D:4D ratio and age at menarche: the impact of methodology

Abstract

The ratio of index finger to ring finger length (2D:4D) is a sexually dimorphic feature and widely used as an indicator of prenatal androgen-estrogen exposure. Several studies have investigated the relationship between the 2D:4D ratio and the onset of the first menstrual period (menarche) in women.

Keywords

• digit ratio
• age at menarche
• female reproduction
• prenatal hormone exposure