Vitamin D Nutrition Status And Its Influencing Factors In Children And Adolescents Aged 6?18 In Yinchuan

Objective:To investigate the vitamin D levels and nutritional status of children aged6~18 in yinchuan,and to analyze the influencing factors of vitamin D nutritional status in children and adolescents,and provide theoretical guidance for improving vitamin D nutritional status in children and adolescents.Methods:1615 children aged 6~18 years in yinchuan were randomly selected by stratified cluster sampling.Questionnaires were used to obtain general information such as child gender,age,birth status,eating behaviors,exercise behaviors and so on.Physical measurement to obtain indicators such as weight,height and BMI;Enzyme-linked immunosorbent assay(ELISA)was used to detect the serum concentration of 25-(OH)D in children and adolescents;Software such as SPSS23.0,Clementine12.0 and MedCalc were used for statistical analysis.Results:1.The median serum 25-hydroxyvitamin D concentration of children and adolescents aged 6~18 in yinchuan was 50.8nmol/L.The results of vitamin D nutritional status showed that the deficiency rate of vitamin D was 49.2%and the appropriate rate of vitamin D was 50.8%.Among them,the rate of vitamin D deficiency was 49.1%for boys and 49.4%for girls,and there was no statistical difference between different genders(?~2=0.011,P=0.916).2.The vitamin D deficiency rate of children and adolescents has statistical significance among different age groups.The 6-year-old group has the highest deficiency rate at 71.7%,followed by the 12-year-old group at 60.7%;There is also a statistically significant difference in the vitamin D deficiency rate of children in each age group between different genders,all of which show the highest vitamin D deficiency rate in the 6-year-old group,followed by the12-year-old group.3.The results of binary logistic regression analysis showed that the main factors influencing the vitamin D nutritional status of children mainly included the time of outdoor exercise every day,age,mother's education background and weekly moderate intensity exercise time.4.The analysis results of C5.0 decision tree combination binary logistic model show that the key factors affecting the vitamin D nutritional status of children are daily outdoor exercise time,age,weekly moderate intensity exercise time,the interaction between outdoor exercise time and age,the interaction between outdoor exercise time and exclusive breastfeeding,and the interaction between age and exclusive breastfeeding.Conclusions:1.The vitamin D deficiency rate of children and adolescents between 6 and18 years old in Yinchuan is high,with the highest in the 6-year-old group;2.Daily outdoor exercise time is the first key factor affecting the vitamin D levels in children and adolescents.