Established Chest Circumference Reference Standard Of Mongolian Children And Adolescents Aged7to18

Objective①To analyze the distribution of growth level in chest circumference of Mongolian students aged from7to18between1985and2005and increasing of average value in chest circumference of urban and rural students in20years.②To describe change trends of maximum growth rate in chest circumference, rapid growth period in chest circumference and two cross-age in chest circumference growth curve of Mongolian students aged from7to18between1985and2005.③To establish the chest circumference reference in different age groups respectively for Mongolian children and adolescents aged from7to18.④To provide the scientific evidence when develop effective intervention strategies and measure in clinical diagnosis and school health work.MethodsThe research objects come from the investigation data provided by’the Nationality Students Fitness and Health Survey, in Tongliao city in year1985、2000and2005.By analyzing the trend of the chest circumference of Mongolian children and adolescents aged from7to18, it is found that after20years rapid growth, the growth speed of Mongolian children and adolescents trend to be smooth after2000.So the chest circumference data of Mongolian children and adolescents aged7to18in2000are used which include5565effective inquiry people. First of all, the ordinal clustering methods is used to divide the optimal age groups. Then combined with deviation method, the chest circumference reference range is established among all age groups. After that, the available survey data acquired in2005is used to validate inspection rate. Finally, we establish a chest circumference reference of Mongolian children and adolescents aged from7to18.Results1. The distribution characteristics in chest circumference of Mongolian studentsThe mean chest circumference of Mongolian students aged from7to18is increasing in all age groups during1985～2005. In this twenty years, the mean chest circumference of Mongolian students aged7to18increases by2.23cm、2.81cm、1.96cm、2.38cm per10years for urban boys, urban girls, rural boys and rural girls respectively. It is concluded that the increasing speed of Mongolian students in chest circumference is higher than the national average level.There is significant difference in chest circumference indices between Mongolian urban and rural students. The chest circumference increasing rate of Mongolian urban students is obvious higher than rural students; the chest growth of Mongolian urban students is larger than that of rural. According to mean growth rate from1985to2005, it can be concluded that urban female>rural female> urban male> urban female.In the beginning15years from1985to2005,the chest circumference growth rate of Mongolian students in each age group has the statistical significance, and the mean growth value is larger than2cm, when it is in a period of rapid growth; However, from2000to2005the chest circumference growth rate of Mongolian students has no statistical significance, which means after15years rapid growth, the mean growth rate of Mongolian students in chest circumference has tended to be stable from2000to2005.2. The secular change of chest circumference maximum growth rateFrom1985to2000, the age of chest circumference maximum growth rate is one year in advanced for Mongolian students except urban boys. However, in2000and2005the age of chest circumference maximum growth rate has tended to be stable for Mongolian students, nearly no change.3. The secular change for period of chest circumference spurt growthOver2cm per year increasing in chest circumference growth is the judgment of the rapid growth standard. From the results, it is found that except urban boys in2000,2005and urban girls in2005, the chest circumference growth spurt ages of Mongolian students in2000and2005are all earlier than in1985. Besides, the chest circumference growth spurt age of Mongolian students in2000is similar to the spurt age in2005; however, the spurt age in2000and2005is quite different in1985. Based on the long-term changing trends of chest circumference rapid growth, it can be found that the changing of rapid growth for chest circumference has tended to be stable from2000to2005.4. Analyze by ordinal clustering methods based on data of Mongolian students’ chest circumference in2000According to analyze of ordinal clustering methods, it can be found that when the optimal point is five, the ratio with the next classification minimum error function e[P (C, K)] is smaller, and is in a stable status. So the optimal age groups is then divided into age7～8、9-11、12～13、14～15、16～18for urban and rural boys while it is divided into age7～9、10～11、12～13、14～18for urban girls and divided into age7～9、10～11、12、13～14、15～18for rural girls, then we establish a reasonable Mongolian Children’s chest circumference reference aged from7-18.5. Establish of a chest circumference reference of Mongolian urban and rural students.6. Inspection rate of chest circumference reference for Mongolian urban and rural students.According to inspection rate of chest circumference reference in2005, it can be seen except the lowest inspection rate of rural female is88.31%, the inspection rate of urban and rural male and urban female is more than90%, meeting requirement of≥85%.It is indicated that the chest circumference reference of Mongolian children and adolescents aged from7to18, which established by data in2000,is exactly representative.Conclusion and recommendation1. It is usually to judge the developmental level of children and adolescents by height and weight, while ignoring the application of chest circumference reference. Therefore, it is urgent to establish a reasonable chest circumference reference of children and adolescents. The chest circumference reference of Mongolian students is rarely appeared in Chinese literature study, thus it is necessary for us to establish this reference so that the physical development status of Mongolian students aged from7to18is well understood.2. It is shown that the average chest circumference of Mongolian children and adolescents aged from7to18has an increase with different degrees, which is coincide with the research result of physical development trend for national minority students in China. It is reported that there is no obvious difference in height and weight between Mongolian urban and rural students aged from6to18, while this study shows that there is obvious difference in chest circumference between Mongolian urban and rural student. The increasing of chest circumference for urban students is larger than that for rural students; the thoracic development for urban students is larger than rural students. Therefore, it is different between height/weight development and chest development, and it is needed to establish reasonable and useful chest circumference reference.3. China has a vast territory and a large population. There are great differences in growth development among different races, this difference is especially obvious between Han nationality and minority nationalities. Therefore, chest circumference centile curves for Han children and adolescents are not applicable for minority nationalities, meanwhile it has so many data which make it difficult to search and not suitable for practical application.4. One measurement can indicate the level child has reached. Continuous monitoring can understand children’s physical growth track and predict the future growth trend. Therefore, only by regular follow-up and comparison it can be known whether children growth follow their growth trace or not, and it can be detected in time for children’s growth disorders disease, such as short stature, abnormal sexual development and so on. As the chest circumference reference of Mongolian children is established, the Mongolian students of normal development track can be monitored continuously so that it helps to improve the levels of growth and development, and to improve the work of sports and health for Mongolia nationality.5. The reference values of chest circumferences established in this paper is simple, useful, clear and visible, and it is beneficial for application in sports, school health, family, clinical and maternal and child health. According to the reference it is known the physical and respiratory organ growth development status of Mongolian children aged from7～18. It is beneficial for discovering early growth disorder, clinical diagnosis and assessment of therapeutic effects for Mongolian children and adolescents. Besides, the method of dividing optimal age groups by age continuity can be more used in work of studying physical, function index for children and adolescents.