Generally speaking, children aged 2- 12 can roughly estimate their height with the following formula:
Height (cm) = (age -2) X5+85 = age X5+75.
Formula for calculating weight by age:
Baby: half-year weight (kg) = birth weight+month age x 0.7.
Weight in the second half of the year (kg) = birth weight +6X0.7+ (month age -6) x0.5.
Weight (kg) of children aged 2- 12 = (age) x2+ 12 = age x2+8.
The evaluation indexes of body weight are as follows:
Severe malnutrition below 60% of standard weight
60-80% of standard weight is moderately malnourished.
80-90% of the standard weight is mildly malnourished.
The normal range is 90- 1 10% of the standard weight.
Standard weight > 120% obese.
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Calculation formula for measuring standard weight
There are two commonly used calculation methods:
One is:
Adult: [height (cm)- 100] × 0.9 = standard weight (kg)
The other is:
Male: height (cm)- 105= standard weight (kg)
Female: Height (cm)- 100= standard weight (kg)
The above two calculation methods have basically been widely used.
In addition, the Academy of Military Sciences recently introduced a method to calculate the ideal weight of China people:
The dead hole in the north? (height cm- 150)×0.6+50 (kg)
The ideal weight of southerners = (height cm- 150)×0.6+48(kg)
This calculation method seems to be more suitable for China people in northern and southern areas.
A simple way to calculate the standard weight of children is:
1 ~ 6 months: birth weight (kg)+month age ×0.6= standard weight (kg)
7 ~ 12 months: birth weight (kg)+month age ×0.5= standard weight (kg)
1 year or older: 8+ age× 2 = standard weight (kg)
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Formula for calculating height
Using genetic factors, that is, using the height of parents to predict. The calculation formula is:
The height of the son as an adult = (father's height+mother's height) × 0.54.
Daughter's adult height = (father's height ×0.923+ mother's height) ÷2 This method does not consider the influence of environmental factors, and the error is large, about 3-5 cm.
2. Use the acquired development of children and adolescents, that is, the full-time age, height and foot length at that time to predict:
Hm = a+(b× c), where hm is the adult height, a is a constant, b is the corresponding coefficient, and c is the height at that time. Different ages have different constants and coefficients. A and B are found in tables made of statistical data. Please refer to the predicted height table provided on page 36 of the Encyclopedia of Medicine and Health for Children and Adolescents. The foot length of children and adolescents at different ages is closely related to their height, including heredity and acquired development. According to the test data of 1979 1 10000 male and female students aged 7-25, the China Youth Physical Fitness Investigation Team developed a method to predict children's adult height by using foot length, and made the corresponding prediction table. This method combines genetic and acquired environmental factors, so the error is very small, about 2 cm.