Table 2.
Frequency of young-onset dementia (all causes) in geographic populations
| PREVALENCE STUDIES | ||||||
|---|---|---|---|---|---|---|
| Study/year | Location | Study population | Case ascertainment | Age, years | Prevalence* | 95% CI |
| Harvey et al., 2003 | London, UK | Catchment area | Registry and surveillance of local practices | 35-64 | 54 | 45.1-64.1 |
| Ikejima et al., 2009 | Ibaraki, Japan | Regional network | Postal survey to clinics, hospitals, nursing facilities, and health agencies | 20-64 | 42.3 | 39.4-45.4 |
| Borroni et al., 2011 | Brescia County, Italy | Regional network of hospital-based centers | Disease registry | 45-65 | 55.1 | 47.0-63.4 |
| Renvoize et al., 2011 | Blackpool, Wyre, and Fylde, UK | Catchment area | Medical records | 45-64 | 62.8 | 48.0-82.3 |
| Withall et al., 2014 | Eastern Sydney, Australia | Catchment area | Structured questionnaire to health professionals, and medical records | 30-64 | 68.2 | 54.9-83.4 |
| INCIDENCE STUDIES | ||||||
|---|---|---|---|---|---|---|
| Incidence* | ||||||
| Mercy et al., 2008 | Cambridgeshire, UK | Catchment area | Referrals from generalists and specialists | 45-64 | 11.5 | 8.6-15.0 |
| Garre-Olmo et al., 2010 | Catalonia, Spain | Regional network of hospitals | Standardized clinical registry | 30-64 | 13.4 | 11.3-15.8 |
| Sanchez Abraham et al., 2013 | Mar del Plata, Argentina | Hospital serving large catchment area | Database of geriatric care department | <65 | 11 | 6.25-19.1 |
*
per 100,000 persons at risk