关键词: 青少年, 维生素D, 缺乏状况, 影响因素

Abstract: Objective To describe the prevalence of vitamin D (Vit D) deficiency in adolescents in Harbin city,and to analyze the influencing factors,in order to provide theoretical basis for Vit D deficiency intervention in adolescents from local area. Methods The level of serum Vit D was measured and questionnaires were filled out by students of grade 6~8 in a middle school of Harbin City. Results A total of 565 middle school students were enrolled in this study.The level of serum 25-(OH)D was (15.25±6.98) ng/ml,the prevalence of Vit D severe deficiency,deficiency,insufficiency and sufficiency were 19.47%,62.12%,16.28% and 2.12% respectively.Demographic characteristics analysis showed that students who were girls or lower age,or lower parents education level had lower serum 25-(OH)D levels and higher Vit D deficiency prevalence,and the differences were statistically significant (P<0.05).Analysis of the source of Vit D showed that 25.31% of students had daily extra Vit D supplements,but only 18.18% took more than 600 U/d; 36.46% of students had daily milk drinking more than 250 ml; 74.87% of students did daily outdoor activities more than 30 minutes.Students with frequent milk drinking,more milk intake and longer daily time activities outdoors had higher serum 25-(OH)D level,and the difference was statistically significant (P<0.05).Multiple linear regression analysis showed that male students,elder age students,students with higher education level of parents and longer daily time activity outdoors had higher serum 25-(OH)D level. Conclusions The status of Vit D deficiency in adolescents in Harbin city is serious,and the influencing factors are complex.It is urgent to take effective measures to improve the regional epidemic status of Vit D deficiency.

Key words: adolescents, vitamin D, deficiency status, influencing factors