Dual energy X-Ray absorptiometry body composition reference values from NHANES

Area of Science:

• Body composition analysis
• Public health research
• Anthropometry

Background:

• Dual energy x-ray absorptiometry (DXA) provides detailed body composition data.
• National Health and Nutrition Examination Survey (NHANES) data offers a population-based sample.
• Previous DXA datasets lacked comprehensive reference values across age and diverse populations.

Purpose of the Study:

• To establish age- and sex-specific DXA whole body reference values for body fat, lean mass, and bone mineral content.
• To develop Fat Mass Index (FMI) classification thresholds analogous to Body Mass Index (BMI).
• To provide normative data for clinical, research, and epidemiological applications.

Main Methods:

• Utilized a 1999-2004 NHANES dataset of fan beam DXA scans from 15 US counties.
• Analyzed whole body DXA measures including %fat, fat mass/height(2), lean mass/height(2), BMC, and BMD.
• Partitioned data by gender and ethnicity; normalized values for age, height, or lean mass as appropriate.

Main Results:

• Generated comprehensive DXA reference values for adults (8-85 years) and children.
• Established Fat Mass Index (FMI) classification thresholds based on BMI criteria.
• Provided reference data stratified by gender and ethnicity.

Conclusions:

• The developed DXA reference values and FMI thresholds are valuable tools for assessing body composition abnormalities.
• These data support clinical evaluations, research, and epidemiological studies in diverse populations.
• The findings aid in establishing criteria for clinical trials and understanding population health trends.