关键词: 小学生, 维生素D, 体格生长

Abstract: Objective To study the correlation between vitamin D and physical growth in elementary school students in Kunming in summer,in order to provide clinical data for the prevention of short stature and obesity in children. Methods A stratified random sampling method was used to select 591 research subjects in 4 districts of Kunming from June to August 2018.Physical measurements,serum 25-(OH)D test and ultrasound bone density detection were performed to all participants.Serum 25-(OH)D level,body mass index (BMI) and bone strength Z values of different age groups,as well as vitamin D nutritional status of male and female children at different ages were compared.The correlation between 25-(OH)D levels and BMI,bone strength Z value and height were analyzed. Results Significant differences were found on height,weight and BMI for children with the same age.With the increase of grades,the level of serum 25-(OH)D decreased(F=37.646,P＜0.001),BMI showed an upward trend(F=1 343.002,P＝0.001),and the bone strength Z value showed a downward trend(F=34.489,P＜0.001).With the increase of age,the proportion of vitamin D deficiency had an increasing trend.Overall,the ratio of vitamin D adequacy in boys was 48.38% and that in girls was 48.06%.25-(OH)D level was negatively correlated with BMI (r=-0.673,P<0.01),positively correlated with bone strength Z value and height (r=0.514,0.561, P<0.01). Conclusions More than half of the primary school students in this study are lack of 25-(OH)D.Children are suggested to do more outdoor exercise and take vitamin D supplementation orally so as to reduce childhood short stature and obesity.

Key words: elementary school students, vitamin D, physical growth