NavGeneral InfoEmail Print Geography Global Coverage type Global Time period covered 01/1990 - present Data type Modeled data Summary Estimated moderate neural tube defects birth prevalence for DisMod models. Keywords Neural tube defects Citation Contributors Institute for Health Metrics and Evaluation (IHME) Suggested citation Institute for Health Metrics and Evaluation (IHME). IHME GBD DisMod Moderate Neural Tube Defects Birth Prevalence Estimates. GHDx Entry last modified on: Nov 6, 2018