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Equations for predicting height for elderly Mexican Americans are not applicable for elderly Mexicans
Victor Manuel Mendoza-Núnez1, Martha A Sánchez-Rodríguez, Armando Cervantes-Sandoval
1Unidad de Investigación en Gerontología, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Mexico City, Mexico. mendovic@servidor.unam.mx
Summary
Predicting elderly height is crucial for nutritional assessment. New equations using knee height were developed for elderly Mexicans, as existing formulas for Mexican Americans were found to be inapplicable.
Area of Science:
- Gerontology
- Nutritional Epidemiology
- Anthropometry
Background:
- Accurate height measurement is essential for assessing nutritional status, particularly in the elderly.
- Elderly individuals often face challenges in achieving the correct posture for standing height measurements.
- Existing predictive equations for height based on knee height may not be universally applicable across different ethnic populations.
Purpose of the Study:
- To develop and validate new equations for predicting the height of elderly Mexicans using knee height.
- To assess the applicability of existing height prediction equations (Chumlea et al., 1998) for elderly Mexican populations.
Main Methods:
- A cross-sectional study involving 736 elderly individuals (186 males, 550 females, mean age 74.7 years).
- Measurement of standing height and knee height (without shoes) in millimeters.
- Application of multiple regression analysis and cross-validation to derive and test predictive equations.
Main Results:
- Strong correlations were found between knee height and standing height in both men (r = 0.83) and women (r = 0.86).
- New regression equations were established: Men: height (cm) = 52.6 + (2.17 × knee height in cm); Women: height (cm) = 73.7 + (1.99 × knee height in cm) - (0.23 × age in years).
- Cross-validation indicated that the developed equations had acceptable predictive accuracy with pure error less than root mean square error (RMSE).
Conclusions:
- The developed knee height-based equations provide a reliable method for estimating height in elderly Mexicans.
- Previously established equations for elderly Mexican Americans were found to be inaccurate for elderly Mexicans, highlighting the need for population-specific formulas.
- Accurate height estimation in elderly populations is vital for appropriate nutritional status assessment and health monitoring.