Calculating Body Mass Index (BMI) for children and teens involves a unique method that takes into account several factors. Here is a detailed step-by-step solution on how BMI for children and teens is calculated:
1. Weight and Height Measurement: First, the child's weight and height are accurately measured. This is because BMI is dependent on both parameters.
2. Age and Sex Consideration: Unlike adults, where BMI is a straightforward calculation based only on weight and height, for children and teens, the calculation must factor in their age and sex. This is essential as children's body fat content varies with age and differs between boys and girls.
3. Comparison with Standard Growth Charts: The measured weight and height are then compared with standardized growth charts that reflect the growth patterns of children and teens. These charts are typically provided by health organizations and are based on large sample populations.
4. Percentile Calculation: Using the growth charts, the BMI is converted into a percentile. This percentile shows how a child's BMI compares to other children of the same age and sex. For instance, a BMI percentile of 70 means the child's BMI is higher than 70% of children of the same age and sex.
Putting it all together, we conclude that the BMI for children and teens is calculated by taking their weight and height, in comparison with other children's weight and height of the same age and sex.
Therefore, the correct answer to the question is:
By taking their weight and height, in comparison with other children's weight and height of the same age and sex.
