The population-based study was a one-time thematic household survey to identify the prevalence of dementia, the proportion of different severity levels, and the subtypes of dementia among 6,100 people aged 60 or over living in the community (Elderly Commission, 2006).

References:

Elderly Commission. (2006). Prevalence of dementia in Hong Kong.  Retrieved from https://www.elderlycommission.gov.hk/en/download/meeting/Study%20on%20Prevalence%20of%20dementia.pdf.