title: Prevalence of dementia in Egypt: a systematic review.
abstract: BACKGROUND
  With the growing prevalence of dementia worldwide, two-third of the people with dementia are projected to be from the developing countries by 2050.
  
  
  OBJECTIVE
  This study reviews the literature regarding dementia prevalence in Egypt.
  
  
  METHODS
  Six databases were systematically searched from their dates of inception till July 2016. Studies published in English and reporting dementia prevalence among nonhospitalized individuals after clinical examinations were considered eligible. References were screened independently by two reviewers in two steps: 1) abstract screening and 2) full-text reviewing. In addition, quality of the included studies was assessed using the Newcastle-Ottawa scale.
  
  
  RESULTS
  Of the 1,630 references retrieved, six studies (n=28,029 participants) met our inclusion criteria. In all studies, dementia was ascertained using a three-phase survey (Phase I: screening, Phase II: clinical diagnosis, Phase III: laboratory investigations). The dementia prevalence ranged from 2.01% to 5.07%. Dementia increased with age, with the rapid increase among those aging ≥80. Also, its prevalence was higher among illiterate groups than among educated groups. Included studies were of low risk of bias.
  
  
  CONCLUSIONS
  Dementia prevalence in Egypt demands including people with dementia in the health care system and promoting the awareness of dementia among the public. Also, more epidemiological studies in this field are needed.
authors.affiliation: Faculty of Medicine, Mansoura University, Mansoura.
authors.forename: Mohamed H
authors.initials: MH
authors.lastname: Elshahidi
authors.affiliation: Faculty of Medicine, Zagazig University, Zagazig.
authors.forename: Muhammad A
authors.initials: MA
authors.lastname: Elhadidi
authors.affiliation: Faculty of Medicine, Mansoura University, Mansoura.
authors.forename: Ahmed A
authors.initials: AA
authors.lastname: Sharaqi
authors.affiliation: Faculty of Medicine, Sohag University, Sohag, Egypt.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Mostafa
authors.affiliation: Faculty of Medicine, Mansoura University, Mansoura.
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Elzhery
keywords: Alzheimer’s disease; aging; epidemiology; vascular dementia