What is your head circumference?

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KimJ
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12 Nov 2006, 12:01 am

So what is normal head circumference for adults, men and women? I'm 58cm. All the sites I found on the internet were concerned with babies and the rate of growth. Not any static standards.

anbuend
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12 Nov 2006, 5:32 pm

I don't know how accurate this is but I found this:

Quote:

An average head size for a man is 58 cms in European Sizing or 7 1/8 UK sizing and 7 1/4 US sizing. The average head size for a lady is 55 cms. Probably the largest head size you will ever find, will be 64cms and the smallest 51cms.

Head sizes and shapes differ from country to country with the smallest heads being in the Far Eastern countries and the largest in Germany. With regards to shape, these can be either very round or oval, with the far eastern countries having a rounder head and the western countries tending to have a more oval shape.

At any rate, this thing about head size is more about rate of head growth in early childhood, not about the size in the end. It clearly doesn't apply to people with Rett's syndrome, whose head growth <em>slows</em> in early childhood, nor to those of us who are autistic associated with various other 'syndromes' that cause among other things small head size.

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SteveK
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12 Nov 2006, 11:28 pm

That's funny. I was just about to show another set of criteria. I trust mine more, since they are in line with what is here!

MALE: 55cm
FEMALE: 49.68cm

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anbuend
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12 Nov 2006, 11:51 pm

That sounds low. Because I know my head size is small even for an adult female, and it's larger than your number.

walk-in-the-rain
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13 Nov 2006, 12:25 am

anbuend wrote:

My daughter has microcephaly and it is related to rate of growth in early childhood. Growth also is really not tracked after a while since I think most of it occurs in childhood. When looking at the actual growth charts they are difficult to translate because they work on a curve with deviation from the mean. (My daughter doesn't have autism - she is labeled mild MR due to the micro.)

anbuend
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13 Nov 2006, 12:28 am

Yeah, I appear have one of those things that usually causes smaller head size (among lots of other stuff), but there's quite a range and some people are on the smaller end of normal rather than full microcephaly.

rdos
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13 Nov 2006, 12:41 am

The autistic *adult* head size is larger than normal. Evidence:
http://www.rdos.net/eng/aspeval/#191

Builds upon a study with 5629 people, which is magnitudes more than "professional" researchers ever use.

I suppose NTs are afraid of the implications of larger heads / brain volume / IQ in autistics. ;-)

walk-in-the-rain
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13 Nov 2006, 1:03 am

anbuend wrote:

You can defintely have a small head size and not have micro. The actual computation is more complex than looking at the measurement - I was just reviewing it from the files of a micro group and had a laugh at the detailed instructions to figure out the deviations. With my daughter we couldnt' really tell when she was little - although the neuro spotted it right away - but now that she is a teen her forehead is small and that makes her face look wider. Still not all that noticeable though I don't think.

walk-in-the-rain
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13 Nov 2006, 1:09 am

rdos wrote:

I don't think that means that someone must have a large head size in order to be autistic. My son has been seen by three professionals and diagnsoed with autism by all three but I don't think he has a large head. Average size really. That may be characteristic of a subset but until there is a clear test for autism I don't think you can say across the board that it is definitive.

anbuend
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13 Nov 2006, 1:47 am

walk-in-the-rain wrote:

The thing I'm talking about, small head size/microcephaly is only part of the picture (and there's considerable overlap with the normal head size) and not the most significant part (the more significant parts being more various other body constructions, that I do have most of).

rdos
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13 Nov 2006, 2:26 am

walk-in-the-rain wrote:

rdos wrote:

Exactly. If you read the link I posted, the correlation between Aspie control group and NT control group is only 0.17, which is a rather low correlation. However, the question is linked to Aspie-ability and Aspie-biology, meaning that it is related to strengths of Aspies. The question also have average factor-analys loading, so it is possible it is actually more significant for the high-functioning part of the spectrum.

SteveK
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13 Nov 2006, 8:10 am

anbuend,

So what PRECISELY does it mean?

191. Do you have a larger head (or hat size) than normal?
Quiz versions: III:92, 5629 answers
Aspie-neurotypical correlation: .17
Aspie score: NO 0, YES 5
Neurotypical score: NO 0, YES 0
PCA: Hn: .06, Hs: .01, g: .06
Correlates with: Aspie biology (.26), Aspie ability (.24)

Outside of seeing this as 5 answers for yes from aspies, I can make no sense of this. That is not a big enough sample.

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rdos
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13 Nov 2006, 9:12 am

SteveK wrote:

The sample is 5629. The score differences (5 Aspie-scores) is the factor analysis result which is based on all 5629. The Aspie-neurotypical correlation is based on less people, probably 500-1000 (it only uses people in NT-control-group and self/professionally diagnosed Aspies).
If this question were to be repeated in a new quiz-version, it would give 5 points on Aspie. The highest Aspie-loaded questions give 10-15 points.

heps89
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24 Jun 2015, 11:27 am

61cm

btbnnyr
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24 Jun 2015, 11:31 am

Low 50s to low 60s are range of normal head sizes for adults.
This range from the head circumference ranges for small, medium, and large eeg caps.

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iliketrees
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24 Jun 2015, 11:34 am

We're measuring the biggest part right?

That comes out at 50cm for me, so just in the normal range then.

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