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Anemia is a global public health problem, especially common among children in developing countries, which affects their physical and mental health development. However, there is currently a lack of research on the relationship between anemia and academic performance. The objective of this study was to explore the association between anemia and academic performance, and the possible factors mediating this association among Chinese children. The data for this study came from the baseline survey of the Chinese Education Panel Survey Elementary School Cohort. The cohort was conducted from September 2018 to June 2019 in 160 elementary schools, covering 20 provinces and 40 counties/districts throughout China. Paper-based questionnaires were used, completed by 4th grade students, parents, head teachers, main teachers, and principals. The data used included questionnaire responses, physical measurements, and academic performance of 17,695 students. Based on students' hemoglobin levels and school altitude data, we grouped them into anemia and nonanemia categories using WHO criteria. The anemia group had 1,154 individuals, while the nonanemia group had 16,541 individuals. An ordinary least squares regression and mediation effect analysis were conducted. Our findings found the prevalence of anemia was 6.52% among Chinese Grade 4 students. Students without anemia had a higher average test score for three academic subjects than students with anemia (P < 0.001); their test scores for Chinese, Mathematics, and English were also higher (P < 0.05). Multivariate regression analysis showed a negative association between anemia and average test scores as well as individual test scores for the three subjects. Mediation analysis found that anemia affected academic performance directly (P < 0.05), and indirectly by decreasing the cognition score (P < 0.05). The indirect effect was 19.9% of the total effect. Findings highlighted anemia affected academic performance both directly and indirectly. Nutrition-related interventions should be implemented to prevent a decrease in academic performance among students with anemia. [ABSTRACT FROM AUTHOR]

The role of formal volunteering in mental health promotion among older adults in China has been widely discussed during recent decades. However, the relationship connecting mental health with cross‐level interaction (i.e., average levels of participation in the community vs. individual participation) is still unclear. This paper examined the effects of cross‐level formal volunteering on depressive symptoms among older adults living in China. Using two waves of the China Longitudinal Aging Social Survey, a sample of 3128 Chinese older adults was surveyed in 2014 and 2016. Depressive symptoms were measured using the abbreviated CES‐D‐9. Individual fixed‐effects ordinary least squares regression models assessed the associations between individual‐ and community‐level formal volunteering and depressive symptoms in urban and rural areas separately. We found that in the urban sample, formal volunteering activities were negatively associated with depressive symptoms at the individual level (β = −0.49, SE = 0.22, p < 0.05). Higher community‐level formal volunteering was positively associated with depressive symptoms (β = 2.82, SE = 1.42, p < 0.05). When adding interactions between individual and community levels, engagement in individual‐level formal volunteering was associated with lower rates of depressive symptoms as community volunteering participation levels increased (β = −3.07, SE = 1.07, p < 0.01). High community‐level volunteering participation was detrimental for non‐volunteers. In rural areas, neither community‐ nor individual‐level formal volunteering was associated with changes in depressive symptoms. The current findings demonstrate formal volunteering may not always benefit mental health for all. The effects may depend on the community context and individual choices. Social policies aimed to promote mental health through formal volunteering need to be tailored according to the specific community social environment. [ABSTRACT FROM AUTHOR]