Head circumference

By Zani AlamWPGH

Learning intention: interpreting growth charts

Circumference reminds me of

Circumference of a circle

The boundary line

The distance around something

Perimeter of a circle

Percentile

Percentile is not the same as percentage

Rank

Can be confused with precent or percentage comparing something such as

test scores, height, salaries etc

Percentile charts are used to plot your baby's changing weight, length (or height), and head circumference, and are often referred to as 'percentile charts'.

Percentile charts aim:- to give you a visual indication about how your baby is

progressing over time.- See where they fall in relation to the rest of the population

average, for either girls or boys.

The percentile graphs are marked with curved lines that represent the different percentiles. The main percentile bands are the 10th, 50th and 90th percentiles, but they may also have the 5th, 25th, 75th and 95th percentiles.

Percentile ranks are an easy way to convey an individual's standing at graduation relative to other graduates.

http://www0.health.nsw.gov.au/pubs/2011/pdf/blue_book_2011_48-61.pdf

Heading

Horizontal axis: age in months 36 months. How many years?

Starting at birth means 0

Vertical axis: head circumference

Measurement are in: cm and in

The scale on the side is going up by 0.2

37

10th percentile

Marked with curved lines

If your head circumference lies on the 10th percentile, what does it mean?It means 10 % of the children have a circumference smaller than you and 90 % of children have a circumference bigger than you.

For head circumference

it means 25 of the kids have a circumference higher than you and 75% lower than you.

Q: If your head circumference lies on the75th percentile what does it mean?

If you lie on the middle which is the thick line (50th) you have the middle percentile (median) you are in the middle.

If your baby is on the 95th percentile, only 5% of other babies of the same age are heavier than your baby, and 95% weigh less.

For weight

If your baby is on the '10th percentile' for weight, it means that 90% of other babies their age are heavier than he or she is, and 10% of other babies weigh less.

Activity1Use a tape measure and measure your partner’s head circumference.Activity2Give students a blank chart and give all the words and they have to paste them on the graph.

Head Circumference ChartFor an accurate head measure, place a tape measure across the forehead and measure around the full circumference of the head.

http://www.craftyarncouncil.com/headsize.html

Heading

Vertical axis: Head circumference

The scale on the side is going up by 0.2

Measurement are in: cm and in

Starting at birth means 0

Horizontal axis: age in months

Marked with curved lines

10th percentile

36 months

Heading

Vertical axis: Head circumference

The scale on the side is going up by 0.2

Measurement are in: cm and in

Starting at birth means 0

Horizontal axis: age in months

Marked with curved lines

10th percentile

36 months

Heading

Vertical axis: Head circumference

The scale on the side is going up by 0.2

Measurement are in: cm and in

Starting at birth means 0

Horizontal axis: age in months

Marked with curved lines

10th percentile

36 months