title: [Influential factors for anemia in pregnancy based on a nested case-control study in Changsha].
abstract: OBJECTIVE
  To explore the prevalence of anemia during pregnancy and the influential factors in changsha city, and to provide scientific evidence for prevention and intervention of anemia during pregnancy.
  
  
  METHODS
  A cluster sampling of 713 mothers, who delivered baby between January 1, 2013 and December 31, 2013 in the three streets of kaifu district of Changsha, was selected to establish a retrospective cohort. The maternal health information during pregnancy was collected within 15 days after the delivery. The influential factors of anemia during pregnancy were analyzed by the method of retrospective nested case-control study and conditional logistic regression.
  
  
  RESULTS
  The prevalence of anemia during pregnancy in Changsha was 9.96%. The multiple conditional logistic regression results show that high family income (OR=0.632, P=0.020), high education level (OR=0.276, P=0.033), folic acid supplement (OR =0.248, P=0.050), iron supplement (OR=0.272, P<0.001) and eating blood products (OR=0.588, P=0.044) were the beneficial factors for anemia during pregnancy, while multipara (OR=2.917, P=0.003), long duration of menstrual period before pregnancy (OR=1.335, P=0.041), living in new decoration housing (OR=3.690, P=0.045) and tea-drinking (OR=1.365, P=0.094) were the risk factors for anemia during pregnancy.
  
  
  CONCLUSIONS
  The prevalence of anemia during pregnancy in Changsha is below the average levels. The occurrence of anemia during pregnancy is closely related to the women's economic level and nutritional status. Women should strengthen maternal nutrition during pregnancy and bedroom environment monitor, drink little strong tea and improve the nutritional status of iron during pregnancy.
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Tan
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Li
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Gao
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Shiting
authors.initials: S
authors.lastname: Xiang
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: He
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Li
authors.initials: L
authors.lastname: Huang
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Changhui
authors.initials: C
authors.lastname: Xiong
authors.affiliation: Kaifu District Health Bureau, Changsha 410008, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Yan
authors.affiliation: Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha 410078, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yan
mesh_terms: D000740:Anemia; D016022:Case-Control Studies; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D007501:Iron; D009752:Nutritional Status; D011247:Pregnancy; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D007501:Iron