For pre-adolescents and adolescents, a BMI-for-age percentile that is higher than the 5th percentile and lower than the 85th percentile is generally considered to be in the normal/healthy range.

Question

BlackTom AI · Accepted Answer

BMI-for-age percentiles classify weight status in children: underweight is below the 5th percentile, healthy/normal weight is from the 5th to less than the 85th percentile, overweight is from the 85th to less than the 95th percentile, and obesity is at or above the 95th percentile (CDC growth chart cutoffs).

1. Relevant knowledge points and concepts
- Body mass index (BMI) = weight (kg) / height (m)^2.
- For children and adolescents, BMI is interpreted relative to age- and sex-specific percentiles from growth charts.
- The standard percentile categories: <5th underweight; 5th to <85th healthy/normal; 85th to <95th overweight; ≥95th obese.

2. Step-by-step reasoning
- The statement asserts that a BMI-for-age percentile >5th and <85th is considered normal/healthy.
- Translate the statement into the standard category: values between the 5th and 85th percentiles (exclusive in phrasing; commonly cited as ≥5th and <85th) correspond to the healthy/normal range per CDC.

3. Example calculation (intermediate steps)
- Suppose a 12-year-old boy weighs 40 kg and is 1.5 m tall. BMI = 40 / (1.5^2) = 40 / 2.25 = 17.78.
- Using CDC charts, that BMI might correspond to roughly the 60th percentile for that age/sex — which falls between the 5th and 85th percentiles and thus is a healthy weight.

4. Why the correct answer is correct
- The CDC and pediatric guidelines explicitly designate the 5th–<85th percentile range as healthy/normal for pre-adolescents and adolescents, so the statement matches authoritative definitions.

5. Why the other option is incorrect
- Choosing False would contradict established growth-chart cutoffs; the false choice would imply the 5th–85th range is not healthy, which is inconsistent with standard pediatric guidance.

6. Conclusion
- Therefore the statement is True, matching the provided correct answer.

For pre-adolescents and adolescents, a BMI-for-age percentile that is higher than the 5th percentile and lower than the 85th percentile is generally considered to be in the normal/healthy range.判断题

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