Growth curve
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Growth curve (Saiko Kyokensen) is the degree of physical development of, the horizontal axis is represented by the data you want to examine the vertical axis. Since it is represented by a curve, it can also capture the speed of growth at the same time. Often used against, it helps to judge (·). Of course it is also possible to create growth curves for other data, such as growth curves such as · (BMI) ·.
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How to draw a reference curve
There are two ways of drawing curves as the reference of growth curves:curve(SD curve) andpercentile curve(percentile curve).
Standard deviation curve
It is a growth curve that you create by assuming that the data you want to check is playing. Draw a total of five curves, plotting average values for each age and curves corresponding to + 1SD, + 2SD, -1SD, -2SD. Since it can be calculated by calculation, it is easy to evaluate each data. However, with respect to data that is not normally distributed ("weight" is a typical example thereof), there is also a disadvantage that drawing this curve itself becomes statistically meaningless. Percentile curve
A curve that enables you to tie a series of points on how many% of people are below this value regardless of the distribution of the data you want to investigate. I usually draw 7 pieces of 3%, 10%, 25%, 50%, 75%, 90%, 97%. For example, a point on a 25% curve indicates that 25% of people take lower values. Since it is unnecessary to obey the normal distribution, it can be drawn for various data, but there is a disadvantage that it can not be evaluated against an extremely high (low) value.
In Japan, standard deviation curves are often used exclusively, but worldwide often adopt percentile curves.
Method of judging growth disorder
The following two cases can be judged as having growth defects using growth curves.
- The value for a child is out of the range from -2 SD to + 2 SD (or it is out of the range from 3 to 97 th percentile)
- If the speed of a value for a child straddles the growth curve (for example, it was + 1 SD at the age of 10, but it is -1 SD at the age of 15)
In the former case, the value itself is out of the reference range, and the latter shows that the speed is out of the standard.
However, it is not necessarily morbid to get out of the growth curve, and there are things that can be said to be a constitution rather than a disease like a disease.
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Post Date : 2018-03-01 03:00
This article is taken from the Japanese Wikipedia Growth curve
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