A Study On Body Fat Mass And Obesity Evaluation Among Uyghurs In South Xinjiang

ObjectiveTo understand the body fat content of Uyghurs in South Xinjiang by measuring body fat content and related indexes through bioresistance resistance method,and also to evaluate obesity by using 7 indexes such as BMI,WC,WHR,WHt R,BAI,PBF and VFI,to compare the accuracy of 7 indexes to evaluate obesity,and to determine the most suitable indexes for obesity evaluation of Uyghurs in South Xinjiang and their best cut-off point.MethodsBased on informed consent,adult Uyghur residents aged 18 years or above,434 males and 677 females,a total of 1111,were selected for the study.Using a bioelectrical impedance analyser,the subjects were measured for height,weight,circumference,BMI,total fat mass,trunk fat mass,left upper limb fat mass,left lower limb fat mass,right upper limb fat mass and right lower limb fat mass.Obesity evaluation of Uyghurs in South Xinjiang was carried out using seven indicators,including BMI,WC,WHR,WHt R,BAI,PBF and VFI.Gender differences in each measurement were analysed using t-test.One-way ANOVA was used to analyse the differences between age groups for each measurement index.Differences between body fat percentage determination of obesity prevalence were analysed using the chi-square test.Linear correlation analysis was used to conduct the analysis of the correlation of each indicator among the Uyghurs in South Xinjiang.The Kappa consistency test was used to conduct the analysis of consistency of obesity evaluation indicators.ROC curve analysis was used to compare the accuracy of individual obesity indicators for obesity screeningResults1.In all age groups,there were gender differences(P<0.05)in all indicators except for trunk fat mass(20 years group)and visceral fat mass(20-40 years group,60,70 and above).Both trunk and limb fat rates showed significantly higher in women than in men(P<0.05),and visceral fat grades showed higher in men than in women(P<0.05).Lower limb adiposity,visceral adiposity,upper limb adiposity rate and visceral adiposity grade in men differed between age groups(P<0.05),showing an increase with age,peaking at 40-50 years.Differences in all 15 adiposity indicators in women differed between age groups(P<0.05),with each indicator increasing with age and peaking at age 50.2.The obesity rate among Uyghurs in South Xinjiang was 37.4%,with a significantly higher prevalence of obesity among females(47.6%)than males(21.4%)(P<0.05).Men had the highest prevalence of obesity in the 70 and above group(27.8%);women had the highest prevalence of obesity in the 50 years old group(62.8%).3.The results of the Kappa consistency test showed high agreement between BMI and PBF for judging obesity in men and medium agreement between WC and PBF for judging obesity in women.The ROC curve analysis,using PBF as the criterion,showed that BMI had the largest area under the curve(AUC),followed by VFI.4.The obesity incidence rate of the Uyghurs in South Xinjiang is higher than the national and global average level,which is close to that of neighboring countries Russia and Kazakhstan,lower than that of the Uyghur people in North Xinjiang and higher than that of the Han people in North Xinjiang.Conclusions1.There were gender differences in adiposity-related indicators among Uyghurs in South Xinjiang,with males having lower adiposity-related indicators than females,except for visceral adiposity,which was higher than females,and both male and female adiposity-related indicators varied with age.2.Using body fat percentage as a diagnostic criterion,the prevalence of obesity among the population in South Xinjiang is 37.4%(male: 21.4%,female:47.6%),which is significantly higher than the national average,with abdominal obesity predominating and obesity being a more prominent problem.3.For the diagnosis of obesity,the BMI method has good agreement with the body fat rate obtained by bioresistance method,and the BMI method can be used as an indicator for obesity screening of Uyghurs in South Xinjiang,with an optimal cut-off point of 26.25 kg/m2 for males and 24.65 kg/m2 for females,while it is recommended that the VFI can be combined with the WC and WHt R for obesity diagnosis in males and females.