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MARCH 31, 2008 Low Digit Ratio associated with delayed menarche. USA research says that low right-hand 2D:4D ratios can be associated with delayed menarche. Research presented by: R.L. Matchock - University of Pennsylvania The prenatal environment of the human fetus is now known to have lasting physiological and behavioral effects into childhood and adulthood. The objective of this study was to examine the relationship between early testosterone exposure, as measured by the ratio of the length of the 2nd and 4th digits (2D:4D ratio), and age of menarche. Retrospective, self-report data on menarcheal age were obtained from 206 healthy female college students, as well as finger length ratio data from both hands. Low right-hand 2D:4D ratios (but not left-hand) were associated with delayed menarche. The results provide evidence for an androgen-delayed menarche link and suggest that this relationship can be continuous in nature and not always categorical as occurs in congenital adrenal hyperplasia, hyperandrogenism, or polycystic ovary syndrome. NOTICE: The menarche is the first menstrual period, or first menstrual bleeding in females. From both social and medical perspectives it is often considered the central event of female puberty, as it signals the possibility of fertility. Find a Palm Reader in the USA! Related sources: The Finger Book What our fingers can tell us What they say about men with long ring fingers Left Handedness & Finger Asymmetry Giving Science the Finger Digit Ratio & Agression Finger Length & Facial Characteristics Finger Length & Children's exam results Finger Length & Osteoarthritis Pointing a Finger at Sports Success Double Digits Talk to the Hand More HAND NEWS

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