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Clinical Anthropometrics and Body Composition from 3-Dimensional Optical Imaging
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Practical cut off values to determine body mass index.

M R Helvaci1, C Ozer, H Kaya

  • 1Medical Faculty of the Mustafa Kemal University, Antakya, Turkey. mramihelvaci@hotmail.com

The Medical Journal of Malaysia
|October 24, 2008
PubMed
Summary

Simple weight cut-offs of 65 kg and 85 kg can significantly identify normal weight, overweight, and obese individuals. These body weight measurements offer a practical alternative to Body Mass Index (BMI) for assessing weight status.

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Area of Science:

  • Clinical Medicine
  • Public Health
  • Anthropometry

Background:

  • Body Mass Index (BMI) is a standard metric for assessing weight status, but simpler alternatives are sought for broader applicability.
  • Understanding the health consequences of excess weight and preventing weight loss in the elderly are critical public health concerns.

Purpose of the Study:

  • To determine if specific body weight cut-off values can reliably indicate Body Mass Index (BMI) categories.
  • To evaluate the diagnostic accuracy of simple weight thresholds (65 kg and 85 kg) in identifying normal weight, overweight, and obesity.

Main Methods:

  • A cross-sectional study involving 954 consecutive check-up patients aged 15-70 years.
  • Exclusion criteria included insulin-treated diabetics and patients with severe illnesses.
  • Patients were categorized into weight groups (<65 kg, 65-85 kg, >85 kg), and sensitivity, specificity, and predictive values were calculated for weight cut-offs against BMI classifications.

Main Results:

  • The 65 kg cut-off showed 61.0% sensitivity and 94.3% specificity for detecting normal weight.
  • For overweight detection, the 65 kg and 85 kg cut-offs yielded 71.5% sensitivity and 63.3% specificity, respectively.
  • Both 65 kg and 85 kg were statistically significant (p=0.000) in identifying normal weight, overweight, and obese individuals.

Conclusions:

  • While Body Mass Index (BMI) remains a valuable tool, specific body weight thresholds (65 kg and 85 kg) demonstrate significant utility.
  • These weight cut-offs provide a practical and statistically valid method for assessing weight status in clinical settings, complementing BMI measurements.