安康市环境富硒和贫硒地区小学生和中学生近视情况分析

Abstract: Objective In the selenium-rich and selenium-poor environments of Ankang City, this study aimed to investigate the association between myopia and the levels of blood selenium and hair selenium in primary and middle school students. Methods According to the distribution of Ankang city selenium resources in soil, the vision and health-related information of 1 720 primary and middle school students from 12 schools in Ziyang County (a selenium-rich area) and Baihe County (a selenium-poor area), were investigated Blood, hair and samples of locally grown crops were collected for selenium content determination. Results The average selenium content in Ziyang County soil is 3.600±2.385 mg/kg, while Baihe County soil contains 0.335±0.134 mg/kg. Ziyang County’s soil contains more selenium than Baihe County, and the difference was statistically significant (t=3.760, P＜0.001). The selenium content in crops such as corn,beans, potatoes, peppers, and pumpkins in Ziyang County is higher than that in Baihe County, the difference was statistically significant (P＜0.05). The overall myopia rate in Ziyang and Baihe County were 58.02% and 69.52%, with primary and middle school students in Ziyang County having a rate of 52.80% and 64.44% , Baihe County having a rate of 65.58% and 74.29%. Primary and middle school students in Ziyang County had lower overall myopia rates than those in Baihe County, the difference was statistically significant (P＜0.05). The overall myopia rates of primary and middle school students in Ziyang County were both lower than those in Baihe County, and the difference was statistically significant (P＜0.05). The selenium content in blood and hair is negatively correlated with the incidence of myopia. Conclusion There was a negative correlation between blood selenium, hair selenium, and the incidence of myopia in primary and secondary school students from selenium-rich and selenium-poor areas.