Age at menarche and the weight-for-height index

Area of Science:

• Pediatric Nutrition
• Anthropometry
• Growth Monitoring

Background:

• Accurate anthropometric measurements are vital for assessing child health and nutritional status.
• Traditional weight-for-height indices may not adequately account for physiological changes during puberty.
• Existing reference standards, such as Tanner-Whitehouse and NCHS, require careful application in adolescent populations.

Purpose of the Study:

• To evaluate the appropriateness of nominal versus adjusted weight-for-height values in black rural primary schoolchildren aged 12-17 years.
• To determine the impact of Tanner-Whitehouse and NCHS standards on weight-for-height index calculations in adolescents.
• To provide recommendations for accurate nutritional assessment in adolescent populations.

Main Methods:

• A sample of 800 black rural primary schoolchildren (aged 12-17 years) was studied.
• Nominal and adjusted weight-for-height values were calculated using Tanner-Whitehouse and US National Center for Health Statistics (NCHS) standards.
• The study analyzed the differences and implications of using each type of value.

Main Results:

• Nominal weight-for-height values require adjustment in adolescents to account for pubertal development.
• Both Tanner-Whitehouse and NCHS reference series necessitate adjustments for accurate assessment.
• The study highlights potential misclassification of nutritional status if nominal values are used without adjustment.

Conclusions:

• Adjusted weight-for-height values are essential for accurate nutritional assessment in adolescents.
• Determining the age at menarche is recommended for precise weight-for-height index calculation in nutritional studies.
• Researchers should specify whether nominal or adjusted values are reported in their methodologies.