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Most differing characteristics will conform to a bell-curve (i.e., normal) distribution which can be broadly described by the mean (peak distribution) and standard deviation (indicator of size of range).Often only the mean or mean difference between sexes is given.Because social and environmental factors affect brain activity and behavior, where differences are found, it can be difficult for researchers to assess whether or not the differences are innate.Studies on this topic explore the possibility of social influences on how both sexes perform in cognitive and behavioral tests.There are also differences in the structure of specific areas of the brain.For example, on average, the SDN (INAH3 in humans) has been repeatedly found to be considerably larger in males than in females.

A subset of such differences is hypothesized to be a product of the evolutionary process of sexual selection.

Traditionally, medical research has mostly been conducted using the male body as the basis for clinical studies.

Similar findings are also reported in the sport medicine literature where males typically account for The findings of these studies have often been applied across the sexes and healthcare providers have assumed a uniform approach in treating both male and female patients.

Sex-related illnesses have various causes: Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans.

These can be of several types, including direct and indirect.

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