[Effects of iron supplement intake on gestational diabetes mellitus in early and middle pregnancy in Chengdu City in 2017].

OBJECTIVE: To explore the effect of iron supplement intake on gestational diabetes mellitus(GDM) in early and middle pregnancy. METHODS: From February to April 2017, a prospective study was conducted among 807 early pregnant women in a prenatal clinic of a maternal and child medical institution in Chengdu City through purposive sampling. Data on maternal demographic characteristics was collected through questionnaire in early pregnancy. In early and middle pregnancy, the information of iron supplement intake were collected with questionnaire, 3-day 24 hour dietary recall method was used to assess maternal diet. According to the WHO recommendation, 60 mg/d iron supplementation during pregnancy was used as the dividing point, <60 mg/d iron supplementation was used as the low level group, and ≥60 mg/d iron supplementation was used as the high level group. At the 24 th to 28 th pregnant week, the oral glucose tolerance test(OGTT) was conducted, and GDM was diagnosed according to the Guidelines for the Diagnosis and Treatment of Pregnancy Diabetes in China(2014). Multivariate unconditional Logistic regression model was used to analyze the effect of iron supplement intake on gestational diabetes mellitus(GDM) in early and middle pregnancy. RESULTS: A total of 739 valid samples were followed up, the age was(28. 22±3. 75) years old. In early and middle pregnancy, the rate of taking iron supplementation was 5. 0% and 67. 9%, 3. 8% and 47. 1% of them iron supplement intake was more than 60 mg/d. After adjustmenting for body mass index, age, dietary iron, etc. Multivariate unconditional Logistic regression analysis showed that there was a positive correlation between the average intake of iron supplement and the occurrence of GDM in women during the second trimester of pregnancy(OR=1. 059, 95%CI 1. 016-1. 104). Compared with the lower iron supplement intake(<60 mg/d) women in midpregnancy, the risk of GDM was 1. 406 times(95%CI 1. 019-1. 939)in the higher iron supplement intake(≥60 mg/d) women. No correlation was found between iron intake in early pregnancy and the occurrence of GDM. CONCLUSION: Iron supplement intake during pregnancy may increase the risk of GDM. Appropriate intake of iron supplement for pregnant women is worth discussing.