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Fisher's principle is an explanation of why the sex ratio of most species is approximately 1:1.

Outlined by Ronald Fisher in his 1930 book, it is an argument in terms of parental expenditure.

Infant mortality is higher in boys than girls in most parts of the world.

Recent studies have found that numerous preconception or prenatal environmental factors affect the probability of a baby being conceived male or female.

For example, in the United States, as of 2006, an adult non-elderly male is 3 to 6 times more likely to become a victim of a homicide and 2.5 to 3.5 times more likely to die in an accident than a female of the same age.

Consequently, the sex ratio tends to reduce as age increases and among the elderly, there is usually a greater proportion of females.

In anthropology and demography, the human sex ratio is the ratio of males to females in a population.

More data are available for humans than for any other species, and the human sex ratio is more studied than that of any other species, but interpreting these statistics can be difficult.

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