Family effects on the digit ratio (2D:4D): The role of the interbirth interval.
Miroslav KrálíkAdela HupkováTomáš ZemanMartin HložekLukáš HlaváčekMarie SlováčkováMartin ČutaPetra UrbanováPublished in: American journal of human biology : the official journal of the Human Biology Council (2019)
Family variables, especially number of older brothers, should be considered as important confounding factors in 2D:4D ratio studies. However, the effect of these variables might be modified by IBI.