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Reference charts for adult head circumference also generally feature homogeneous samples and fail to take height and weight into account. [6] One study in the United States estimated the average human head circumference to be 57 centimetres (22 + 1 ⁄ 2 in) in males and 55 centimetres (21 + 3 ⁄ 4 in) in females.
The adult human brain weighs on average about 1.3 kg. [3] In men the average weight is about 1370 g and in women about 1200 g. [ 4 ] [ contradictory ] The volume is around 1260 cm 3 in men and 1130 cm 3 in women, although there is substantial individual variation. [ 5 ]
the ratio of hip circumference to shoulder circumference varies by biological sex: the average ratio for women is 1:1.03, for men it is 1:1.18. [9] legs (floor to crotch, which are typically three-and-a-half to four heads long; arms about three heads long; hands are as long as the face. [10]
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Macrocephaly is a condition in which circumference of the human head is abnormally large. [1] It may be pathological or harmless, and can be a familial genetic characteristic. . People diagnosed with macrocephaly will receive further medical tests to determine whether the syndrome is accompanied by particular disorde
The Wikipedia article states that the average head circumference in the US is 57cm for males and 55cm for females. That fits in with hat size charts. Also, measuring mine, my brothers and my fathers head just now is as follows. My adult female head is 55cm. My brothers and my fathers are exactly the same at 58cm. We are from the UK.--
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[6] [7] Some academics advocate defining it as head circumference more than three standard deviations below the mean for the age and sex. [8] There is no specific treatment that returns the head size to normal. [3] In general, life expectancy for individuals with microcephaly is reduced, and the prognosis for normal brain function is poor ...