title: [Difficulties of statistical studies on mental deficiency].
mesh_terms: D006782:Hospitals, Special; D006801:Humans; D008607:Intellectual Disability / Q000150:complications / Q000453:epidemiology* / Q000209:etiology; D007361:Intelligence Tests; D008403:Mass Screening; D008499:Medical Records; D011446:Prospective Studies; D012189:Retrospective Studies; D013223:Statistics as Topic; D011795:Surveys and Questionnaires
vernacular_title: Difficulté des enquêtes statistiques sur la déficience mentale.