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Background  Malnutrition and anemia affect large numbers of young children living in poor areas of China. Multi-micronutrient deficiencies may be related to the prevalence of anemia in different populations, and identifying the risk factors that render children susceptible to anemia is the first step in combating anemia effectively.    Methods  In this cross-sectional study, a total of 1370 children under 3 years old were selected based on probability proportional to size sampling principles from poor counties of China. Basic characteristics data were collected by questionnaire; then anthropometrics and hemoglobin were measured in the field and anemia prevalence evaluated. Venous blood was drawn from children aged 12–35 months (N = 553) to evaluate micronutrient status. Logistic regression was used to identify the risk factors for children’s anemia.    Results  Among children aged 0–35 months, the prevalence of stunting, low body weight and wasting was 17.5%, 8.6% and 5.1%, respectively, and 25.6% of the children were affected by anemia, with more anemic infants and younger children than older children ( P  <0.01). There were 26.5%, 12.8%, 14.1% and 20.0% of the children aged 12–35 months affected by iron deficiency, vitamin D deficiency, folic acid deficiency and vitamin B 12  deficiency, respectively. For children aged 0–11 months who were breastfed, the mothers’ anemic status was the only factor associated with the child’s anemia (OR = 2.6; 95% CI: 1.2–5.4,  P  < 0.05). For children aged 12–35 months, multivariate logistic regression indicated that anemia was significantly associated with iron and vitamin B 12  deficiency (OR = 5.3; 95% CI: 1.9–14.5,  P  < 0.01) and monotonous diet (OR = 2.3; 95% CI: 1.1–4.7,  P  < 0.05) after adjusting for age and gender.    Conclusion  The prevalence of anemia was higher in children under 2 years old and requires urgent intervention. An effective intervention strategy should include iron and vitamin B 12  supplements ,  improving dietary diversity and controlling breastfeeding mothers' anemia.

The Influence of Malnutrition and Micronutrient Status on Anemic Risk in Children under 3 Years Old in Poor Areas in China