NavGeneral InfoEmail Print Provider Gallup Geography Global Coverage type Global Time period covered 01/2006 - 12/2018 Series or system Gallup World Poll Data type Survey Keywords Mental and behavioral disorders Citation Contributors Gallup Publisher Gallup Publication year 2019 Suggested citation Gallup. Gallup Analytics - World Poll Negative Experience Index. Washington, D.C., United States of America: Gallup, 2019. GHDx Entry last modified on: Sep 15, 2021