Correlation between 24 h urinary sodium,24 h urinary potassium,urinary sodium-potassium ratio and obesity/central obesity
Objective To analyze the association of 24 h urinary sodium,24 h urinary potassium and sodium-potassium ratio with obesity/central obesity in adults of China,and provide the scientific basis for the formulation of obesity prevention strategies.Methods The data were from the baseline investigation data of"a community-based cluster randomized controlled study of comprehensive intervention on salt reduction among Chinese residents"of China-UK salt reduction action developed from October to December 2018.Method of multi-stage random sampling was used to select 2 639 residents(18-75 years old)from six provinces(Hebei,Heilongjiang,Jiangxi,Hunan,Sichuan and Qinghai)as the subjects.The investigation was performed with physical examination,collecting 24 h urinary sodium,24 h potassium,sodium-potassium ratio.The t test,x2 test,multiple linear regression analysis and multivariate logistic regression were used to analyze the data.The used software was SAS 9.4.Results In 2 639 subjects,the average age was(47.4±12.8)years old,obesity rate was 17.39％and central obesity rate was 63.55％.The 24 h urinary sodium,24 h potassium,sodium-potassium ratio were(192.93±79.19)mmol/d,(40.15±15.56)mmol/d and 5.18±2.18,respectively.After adjusting the related confounding factors,the multivariate logistic regression showed that as compared with the lowest 24 h urinary sodium group(Q1),the highest 24 h urinary sodium group(Q4)was related to high risk of obesity and central obesity(OR=2.427,95％CI:1.739-3.387;OR=2.402,95％CI:1.826-3.158,respectively);as compared with the lowest 24 h urinary sodium-potassium ratio group,the highest 24 h urinary sodium-potassium ratio group was related to high risk of obesity and central obesity(OR=1.414,95％CI:1.040-1.992;OR=1.477,95％CI:1.157-1.885,respectively),P＜0.05.The 24 h urinary potassium was not related to the obesity and central obesity(P＞0.05).Conclusion The 24 h urinary sodium and sodium-potassium ratio are related to obesity and central obesity.It indicates that intake of sodium should be reduced,and the sodium-potassium intake ratio should be controlled.
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