PT29 - PHASE ANGLE REFERENCE VALUES STRATIFIED BY GENDER, AGE, AND BMI FOR HEALTHY CHINESE ADULTS: A MULTICENTER CROSS-SECTIONAL STUDY

PT29

PHASE ANGLE REFERENCE VALUES STRATIFIED BY GENDER, AGE, AND BMI FOR HEALTHY CHINESE ADULTS: A MULTICENTER CROSS-SECTIONAL STUDY

N. Yang¹, W. Chen^1,*

¹Department of Clinical Nutrition, Department of Health Medicine, Peking Union Medical College Hospital, Beijing, China

Rationale: Phase Angle (PhA), measured using Bioelectrical Impedance Analysis (BIA), reflects cellular health and function and is associated with various diseases and prognosis. This study aims to establish reference values for PhA in healthy Chinese adults, stratified by gender, age, and BMI.

Methods: A multicenter cross-sectional study included 40,074 participants. Correlation analysis and multivariate regression, were performed to evaluate the relationships between PhA, gender, age, and BMI. PhA data were categorized by gender, age, and BMI, with mean ± standard deviation used to describe central tendencies and percentiles to represent distribution.

Results: PhA values were significantly higher in males than in females, with males showing an average of 5.95° compared to 5.14° in females (P < 0.001). PhA was negatively correlated with age (r = -0.22, P < 0.01). PhA showed a positive correlation with BMI (r = 0.38, P < 0.01). Reference ranges for PhA were established, showing an increase in PhA with higher BMI and a decrease with increasing age. Interestingly, PhA was lower in obese elderly individuals compared to lean younger individuals, highlighting the importance of BMI stratification in establishing normal PhA reference values.

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Conclusion: This study, based on multicenter large-scale data from China, established the first gender-, age-, and BMI-stratified reference ranges for PhA in healthy adults. The results demonstrate that PhA is significantly influenced by gender, age, and BMI: males exhibit higher PhA than females, individuals with higher BMI show elevated PhA compared to those with lower BMI, and advancing age is associated with a decline in PhA. These findings provide critical baseline data for health assessments and disease screening, while offering scientific evidence for the application of PhA in personalized nutritional interventions and disease management. 

Disclosure of Interest: None declared