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The 2D:4D ratio is calculated by dividing the length of the index finger by the length of the ring finger of the same hand. Other digit ratios are also calculated similarly in the same hand. The digit length is typically measured on the palmar (ventral, "palm-side") hand, from the midpoint of the bottom crease to the tip of the finger. [8]
The difference in finger length is caused by the amount of testosterone and estrogen one receives in the womb. More testosterone means a shorter index finger compared to the ring finger, and more ...
The 2D;4D finger ratio, or relative lengths of the 2nd "index" and 4th "ring" fingers, has become a popular measure of prenatal androgen because of accumulated evidence suggesting the 2D;4D ratios are related to prenatal exposure to testosterone. [56]
Testosterone levels in males and females ; Total testosterone Stage Age range Male Female Values SI units Values SI units ; Infant: Premature (26–28 weeks) 59–125 ng/dL: 2.047–4.337 nmol/L
The average male who reaches 70 years old will have testosterone production that's 30 percent below his peak. T levels in men can vary widely, though they generally decline in men after the age of ...
The type of hands that are physically attractive are those with longer index and ring fingers. [111] Men have a smaller index-to-ring-finger ratio than women. The gender differences in the ratio between the index and ring fingers are said to be influenced by exposure to testosterone within the womb. [112]
What to know about getting your testosterone tested including when to get one, which test to take, what it tells you and more.
Research has linked the ratio of lengths between the index and ring fingers to higher levels of testosterone, and to various physical and behavioral traits such as penis length [31] and risk for development of alcohol dependence [32] or video game addiction. [33]
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