Study On The Distribution Of Blood Pressure And Its Relationship With The Different Types Of Obesity Of Korean-Chinese Schoolchildren In Yanbian Area

Objective To study the distribution characteristics of blood pressure and its relationship with the different types of obesity of Korean-Chinese students in Yanbian area so as to provide the corresponding information for the research of blood pressure of children and adolescents and the guidance for the school health care.Methods1) BY using a cluster sampling method, a total of2011elementary school students (boys,943; girls,1068) aged8-12years old were finally selected in2of primary schools of Korean-Chinese and the survey was carried out in June2010. All of students knew the informed consent.2) The relevant information was collected by the standardized questionnaire.3) Physical examination was carried out in the early morning after12hour fasting, and the height (cm), weight (kg), waist circumference (WC, cm) and blood pressure [systolic blood pressure (SBP) and diastolic blood pressure (DBP)] were measured by using the standardized methods.4) Body mass index (BMI, kg/m2) and waist-to-height ratio (WHtR) were employed as the different index of obesity, and general obesity was screened by the WGOC age-and gender-specific BMI cut-offs and central obesity defined as WHtR≥0.46.5) According to2010Chinese guidelines for management of hypertension and the percentiles of measurement of blood pressure of Korean-Chinese students in Yanbian area,①normal blood pressure (NBP) defined as SBP and DBP<P90;②high normal blood pressure (HNBP) defined as SBP and/or DBP≥P90;③hypertension defined as SBP and/or DBP≥P95.6) Data analysis was performed by SPSS17.0statistical software. Normal distribution measurement data were examined by t-test and analysis of variance, the numeration data were compared with the Chi-square test; the correlation between blood pressure and the different index of obesity was analyzed by a simple correlation analysis and partial correlation analysis; the influencing factors of high blood pressure were analyzed by the logistic regression analysis.Results1) The average level of SBP was107.7±13.3in Korean-Chinese male students and that was106.9±13.4in female students, and there was not sex difference (t=1.290, P>0.05), and that of primary school students of Korean-Chinese in this area was progressively higher with increasing age (Fboy=117.545, Fgirl=186.503; all P<0.001). The average level of DBP was67.4±9.4in Korean-Chinese male students and that was67.8±9.2in female students, and there was not sex difference (t=1.003, P>0.05), and that of primary school students of Korean-Chinese in this area was progressively higher with increasing age (Fboy=41.010, Fgirl=73.346; all P<0.001).2) The locus values of P90and P95of SBP were124.0and130.0and that of DBP were80.0and82.0in Korean-Chinese students in both sexes, respectively.3) The detection rates of high SBP, high DBP and high BP were13.8%,13.4%and21.2%in Korean-Chinese male students, and that were13.0%,15.0%and21.9%in female students, respectively, and there were not sex differences (χ2SBP=4.588,χ2DBP=5.963, χ2BP=4.588; all P>0.05).4) The detection rates of general and central obesity were29.8%and33.1%in Korean-Chinese male students and that were21.8%and25.0%in female students, respectively, and there were significant sex differences (χ2boy=16.833, χ2girl=16.451; all<0.001).5) The average level of BMI of primary school students in this area was progressively higher with increasing BP (FDBP-boy=78.399, FDBP-girl=77.334, FSBP-boy=103.461, FSBP-girl=81.880; all P<0.001) and the average level of WHtR was progressively higher with increasing BP (FDBP-boy=46.593, FDBP-girl=57.619, FSBP-boy=67.163, FSBP-girl=63.245; all P<0.001); the detection rates of general obesity were20.6%in the group of NBP,33.8%in HNBP and61.1%in hypertension, and that of central obesity were25.1%,33.1%and58.6%, respectively, and that of general (χ2=130.632) and central (χ2=74.229) obesity were progressively higher with increasing BP (all P<0.001).6) The partial correlate analysis showed that SBP was positively correlated with BMI and WHtR, the partial correlate coefficient was0.401and0.308(all P<0.001) and DBP was positively correlated with BMI and WHtR, the partial correlate coefficient was0.307and0.259(all P<0.001).7) Our multivariate logistic regression analysis showed that age (compared with8years old, the value of OR aged9-12years old is0.904,1.363,2.023and0.939), general obesity (compared with normal BMI, the OR of overweight and obesity is2.243and4.001) were closely related with high DBP; age (compared with8years old, the value of OR aged9-12years old is0.622,0.686,0.435and0.659), sex (the OR is1.331) and general obesity (compared with normal BMI, the OR of overweight and obesity is2.362and5.526) were closely related with high SBP.Conclusion1) The sex difference was not significant in distribution of SBP and DBP, and the average level of SBP and DBP are progressively increased with the increase of age in Korean-Chinese students.2) The locus values of P90and P95of SBP and DBP are higher in Korean-Chinese students than the standard values of Chinese guidelines for management of hypertension. It is suggested to select the appropriate blood pressure reference norm in screening and diagnosis of high BP for adolescents, and it is important in high BP-related study.3) The detection rates of high BP were21.2%in Korean-Chinese male students and21.9%in female students, and high BP is popular in Korean-Chinese students.4) The average level of BMI and WHtR were progressively higher with the increases of the average level of SBP and DBP, and the detection rates of general and central obesity were progressively higher with the increases of that.5) The prevalence of high DBP was correlated with age and general obesity, and that of high SBP was correlated with age, sex and general obesity, and dose-response relationships were seen between high BP and age, BMI.