| ObjectiveIn this study,a baseline survey and two-year follow-up of rural adult residents lived in the area along the Yangtze River in Anhui province were conducted to obtain changes of body mass index（BMI）,waist circumference（WC）and hypertension status of respondents.Based on the data obtained above,the effects of the dynamic changes of（D-Value）BMI and WC on the incidence of hypertension were explored,which will provide a scientific basis for weight control and primary prevention of hypertension.MethodsIn this study,a multi-stage cluster sampling method was used to conduct the baseline survey from September 2014 to June 2015.Seven towns in chizhou,tongling and ma’anshan were selected,and administrative villages were selected from the seven towns.The residents of selected villages aged 18 or above were enrolled in the investigation.A questionnaire was used to survey the demographics,lifestyle of participants,and physical measurement including height,weight,waist circumference,and blood pressure were conducted on participants.From October 2016 to May 2017,we collected the changes of obesity index and the incidence of hypertension during the two-year follow-up survey.The chi-squared test,Student’s t test and one-way analysis of variance were carried out to examine the differences between the characteristics of all the participants,and the Cox proportional hazard regression were used to explore the effects of dynamic changes in body mass index and waist circumference on the onset of hypertension.ResultsA total of 1358 rural adult residents who had no hypertension at the baseline were included in our study,who ranged in age from 18 to 88 years,592 people were male adult residents（43.6%）and 766 people were female adult residents（56.4%）.The mean value of BMI and WC was 22.76±3.30 kg/m2 and 80.02±9.36 cm..During a mean follow-up of 25.09 months,a total of 275 subjects（114 males and 161 females）developed hypertension,the incidence of hypertension was 20.3%.Of the 925 subjects with a normal baseline BMI,97 subjects became overweight or obese during the two-year follow-up period.Of 803 people with normal waist circumference at baseline,288 subjects developed abdominal obesity.Among 433 subjects who were overweight or obese at baseline,BMI of 30 subjects returned to normal at follow-up.Of the 555subjects with baseline abdominal obesity,111 subjects had normal waist circumference at follow-up.Compared with the lower quartile(P25),subjects with the upper quartile(P75)waist circumference difference had an increased risk of hypertension（HR=1.60,95%CI=1.15-2.24）.Stratified analysis by sex,similar results were obtained for adult male and female residents.Compared to the lower quartile reference group,subjects whose waist circumference difference was the highest quartile with a hypertension risk ratio of 1.75（1.02-2.98）and 1.77（1.13-2.76）,respectively.However,there was no significant association between BMI D-Value and incident hypertension in either gender.Compared with the lowest quartile,the fourth quartile of WC D-value was closely associated with a higher risk of incident hypertension in both gender groups.The results indicated that subjects with abdominal obesity suffered a higher risk of incident hypertension compared with those were not abdominally obese at both baseline and follow-up.However,there is no significant association between BMI D-Value and incident hypertension in either gender.ConclusionsObesity,especially abdominal obesity is still widespread in rural adult residents lived in the area along the Yangtze River in Anhui province.Our findings show that the increase of WC is closely associated with a higher risk of incident hypertension in both gender groups.The dynamic change of waist circumference should be paid attention to,so as to prevent and control the incidence of hypertension among rural adult residents lived in the area along the Yangtze River in Anhui province. |
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