RESUMO
Objective:To understand the school absence due to illnesses in the context of emergency response to COVID-19 in Minhang District， so as to provide a basis for epidemic prevention and control in primary and secondary schools. Methods:Descriptive epidemiological analysis was conducted on the data of school absence due to illnesses in primary and secondary schools in Minhang District in the context of emergency response to COVID-19. Results:During the period of emergency response to COVID-19， the incidence of illness-induced absenteeism in Minhang District was 1.50%. Difference in absenteeism between different months was statistically significant （χ2=1 724.31， P<0.01）. The monthly absenteeism rate in 2020 was higher than that from 2016 to 2019， and the difference was statistically significant （P<0.01）. The rate of symptom-induced absenteeism was 1.28%. Fever was the most common symptom of school absence， and the rate of absence due to fever in 2020 was higher than that of the same period in 2019 and 2016-2018， and the difference was statistically significant （χ2=15 281.33， P<0.01）. Acute upper respiratory tract infection was the number one cause of illness-induced absence during the emergency response period， while infectious diseases were the primary causes of diseases from 2016 to 2018 and in 2019. The difference of infectious disease absence in different years was statistically significant （χ2=1 822.62， P<0.01）. Conclusion:The rate of school absence due to illnesses increased significantly in the context of emergency response to COVID-19 in Minhang District， while the rate of school absence due to infectious diseases decreased significantly. The prevention and control measures during the epidemic period can be used for reference in the future for preventing infectious diseases under normal conditions.
RESUMO
Objective To explore the risk factors of recurrent low hemoglobin(RLH) level among students from 6 to 13 years old, and to formulate strategies and policies in this regard. Methods Surveillance on hemoglobin concentration was conducted among 71 742 students aged from 6 to 13y between 2013-2014 based on the annual physical examination for primary and middle school in Minhang District.Of those students, 670 were diagnosed with low hemoglobin level according to WHO criteria.A 1 ︰ 1 matched case-control study was conducted based on gender, age and school type.Questionnaire surveys for data collection were analyzed using Cox′s proportional hazards regression. Results Factors as pregnancy anemia(OR=2.32, 95%CI:1.49-3.63), non-pregnancy anemia(OR=4.65, 95%CI:1.22-17.69), maternal anemia(OR=2.51, 95%CI:1.50-4.21), drinking strong tea(OR=2.56, 95%CI:1.27-5.13) and dietary bias(OR=1.94, 95%CI:1.45-2.59) were risk factors of recurrent low hemoglobin level.Chewing pencils(OR=1.80, 95%CI:1.25-2.59) or toys(OR=1.79, 95%CI:1.10-2.86) and wasting(OR=3.37, 95%CI:1.11-10.21)might be the risk factors. Conclusion The risk factors of recurrent low hemoglobin level among students aged from 6 to 13 years are related to maternal anemia status and their dietary habits.We should strengthen education for women of child-bearing age, and help to develop healthy eating practices for their babies.Emaciated students should be focused on in this regard.