| Objective:1. To understand growth and development situation of children in Changsha including height, weight and body mass index, establish BMI reference values in screening for obesity and thinness of children aged 3-11 in the region.2. To establish the mathematical model of BMI in screening for children overweight, obesity and thinness.3. To understand self-esteem levels of obese children.Methods:1. Children were collected at 20 kindergartens and 15 primary schools in Changsha by random cluster sampling method. Their height and weight were measured, and the sex and age were recorded. Children growth curves of height, weight and body mass index (BMI) were fitted by LMS method. BMI reference values in screening for children overweight, obesity and thinness were established by percentile method.2. BMI curves in screening for children obesity and thinness of 3-11 year-old children in Changsha were analyzed. The mathematical model of BMI curves in screening for children with overweight, obesity and thinness was fitted by least square method and Matlab software.3. Children were selected randomly at total 30 classes of fourth, fifth and sixth grade in Changsha as subjects. Questionnaire surveys of sample children were investigated by Rosenbeg Self-Esteem Scale. According to the new WHO growth standards, sample children were divided into thinness, normal, overweight and obesity groups, self-esteem levels of different BMI Children were detected by analysis of variance. The distributions of the number of people with high self-esteem and low self-esteem at different weight children were compared by Chi-square analysis.Results:1. Children growth curves of height, weight and body mass index (BMI) of children aged 3-11 in Changsha were fitted by LMS method, their fitting error were small and fitting results were good. Height, weight and body mass index (BMI) of children aged 3-11 in Changsha were different from WHO and national levels. The fifth, eighty fifth, ninety fifth percentile curves as the border points in screening for children overweight, obesity and thinness were verified by height and weight method. BMI reference values in screening for overweight, obesity and thinness of male and female children aged 3-11 in Changsha were established as a section per half year.2. The mathematical model and discrimination formula of BMI in screening for children overweight, obesity and thinness was established successfully by Matlab software, and the discrimination formula was also established.Following are the formulas of BMI reference Values.The formula of BMI reference Values for boys aged 3-5 years old: For thinness:15.33-0.28×years, For overweight:17.54+0.04×years, For obesity:17.87+0.25×years,The formula of BMI reference Values for girls aged 3-5 years old: For thinness:14.87-0.24×years; For overweight:17.56-0.08×years; For obesity:18.02+0.06×years;The formula of BMI reference Values for boys aged 6-11 years old: For thinness:12.98+0.14×years; For overweight:14.28+0.63×years; For obesity:13.88+0.96×years;The formula of BMI reference Values for boys aged 6-11 years old: For thinness:12.19+0.2×years; For overweight:14.12+0.52×years; For obesity:14.44+0.69×years;3. The average score of self-esteem of 1410 children at primary school was 22.73±4.22, the score of self-esteem was negatively correlated with BMI value. The score of self-esteem of children with overweight and obesity was lower than that of children with normal weight (F=12.413, P<0.01). The score of self-esteem of male children with obesity was lower than that of male children with normal weight and overweight (F =6.964, P<0.01). The score of self-esteem of female children with overweight and obesity was lower than that of female children with normal weight (F=5.963, P<0.01). The proportion of low self-esteem in obesity group was greater than that in normal weight and overweight group (χ2=7.02, P< 0.01).Conclusions:1. The height and weight levels of male and female children in Changsha were different from those of national children. The height levels of male and female children at most of the age were all lower than national average level. The weight levels of male children at most of the age were lower than national average levels. The weight levels of female children at all the age were lower than national average level. The BMI levels of male children of all ages in Changsha were greater than those of female children. The BMI levels of male children of all ages in Changsha were greater than WHO and national levels. The BMI levels of female children of all ages in Changsha were greater than national level, those of children less than 10 years old were greater than WHO level, and those of children more than 10 years old were lower than WHO level. BMI reference values in screening for overweight, obesity and thinness of male and female children aged 3-11 in Changsha were established as a section per half year.2. The discrimination formula of BMI in screening for children overweight, obesity and thinness was established successfully. Screening for children overweight, obesity and thinness with the formula is simple and convenient. The mathematical model may be developed some related software for evaluating more easily and quickly whether overweight, obesity or thinness in children and adolescents, especially suitable for screening for nutritional status of children and adolescents in schools, hospitals etc.3. The score of self-esteem of children with overweight and obesity were lower than that of children with normal weight. The proportion of low self-esteem in obesity group was greater than that in normal weight and overweight group. So in monitoring child obesity, children mental state such as self-esteem must be concerned as well as measuring objective indicators such as height and weight etc. |
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