Data sources and study population
This study used data from the Preconception supplementation (PRECONCEPT) study, a double-blind randomized controlled trial to evaluate the effects of preconception micronutrient supplementation on maternal and child health outcomes in Vietnam [
Sample flow WISC-IV: Wechsler Intelligence Scale for Children®—Fourth Edition; SQG: Strengths and Difficulties QuestionnaireThe study was approved by the Ethical Committee of Thai Nguyen National Hospital in Vietnam and Emory University’s Institutional Review Board, Atlanta, Georgia, USA. The trial was registered at ClinicalTrials.Gov as NCT01665378 on 15/08/2012, URL: 