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目的了解不同供餐模式下中小学生血清维生素D水平,为科学供餐预防学生维生素D缺乏提供依据。方法采用分层整群随机抽样法,抽取北京市朝阳区8所走读学校,形式为学校供餐、企业送餐和无供餐。每个学校各年级选取1个班学生为研究对象,采用电化学发光法检测其血清25羟基维生素D[25-(OH)D]水平。结果共检测564例中小学生的血清25-(OH)D,平均水平为(19.10±6.79)mg/L,处于缺乏状态。25-(OH)D水平随年级升高有逐渐下降趋势,差异有统计学意义(P<0.05)。进食学校供餐和企业送餐的学生血清25-(OH)D水平分别为(20.19±7.12)mg/L和(19.24±6.40)mg/L,显著高于无供餐的学生水平(16.63±5.80)mg/L。结论北京市朝阳区中小学学生维生素D轻度缺乏。进食学校供餐和企业送餐的小学生维生素D水平高于无供餐学生。
Objective To understand the serum vitamin D levels of primary and secondary school students in different feeding modes and to provide scientific basis for preventing vitamin D deficiency in students. Methods A stratified cluster random sampling method was used to collect 8 day schools in Chaoyang District, Beijing, in the form of school feeding, business delivery and non-feeding. In each grade, one class of students was chosen as the research object. The level of 25-hydroxyvitamin D [25- (OH) D] was detected by electrochemiluminescence. Results A total of 564 primary and secondary school students were detected serum 25- (OH) D, the average level was (19.10 6.79) mg / L, in a deficient state. The 25- (OH) D level decreased gradually with the increase of grade, the difference was statistically significant (P <0.05). Serum 25- (OH) D levels were (20.19 ± 7.12) mg / L and (19.24 ± 6.40) mg / L, respectively, which were significantly higher than those of students without food supply (16.63 ± 5.80) mg / L. Conclusion Primary and secondary school students in Chaoyang District, Beijing mild deficiency of vitamin D. The pupils who ate school meals and corporate meals had higher levels of vitamin D than those without meals.