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[Body mass index: sensitivity and specificity].

Linda Clemente1, Pedro Moreira, Bruno Oliveira

  • 1Faculdade de Ciências da Nutrição e Alimentação, Universidade do Porto, Porto.

Acta Medica Portuguesa
|October 4, 2005
PubMed
Summary
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Self-reported height and weight are unreliable for assessing overweight and obesity prevalence in university students due to poor sensitivity. Objective measurements are recommended for accurate body mass index (BMI) assessments.

Area of Science:

  • Public Health
  • Anthropometry
  • Epidemiology

Context:

  • Self-reported height and weight are commonly used to determine overweight and obesity prevalence.
  • Reliability of self-reported measures, especially in university student populations, is not well-established.
  • Previous studies have not extensively evaluated the accuracy of self-reported data for BMI calculation.

Purpose:

  • To determine the sensitivity and specificity of self-reported body mass index (BMI).
  • To evaluate the accuracy of self-reported data in assessing overweight and obesity prevalence among university students.
  • To compare self-reported measurements with objective anthropometric assessments.

Summary:

  • A study of 380 university students compared self-reported and objectively measured height, weight, and BMI.

Related Experiment Videos

  • While weight discrepancies were not significant, height and BMI differences were significant, particularly in women.
  • Sensitivity for detecting overweight/obesity was low (50% in women, 70% in men), though specificity was high (99% in women, 98% in men).

    • Impact:

    • Self-reported height and weight data demonstrate poor sensitivity for estimating overweight and obesity.
    • The findings suggest that self-reported data may not be a reliable method for prevalence studies in this demographic.
    • Accurate anthropometric assessments are crucial for reliable epidemiological studies on obesity.