The day care center staff comprised five formal care givers and a leading registered nurse who had received dementia-specific training. Their duties mainly involved general daily services, health programs, and related activities. At admission, general demographic data of the participants, including lifestyle habits, age, gender, body mass index, social, and family histories and medical histories, including diagnosed diseases and medications, were recorded. Moreover, at baseline, and every 3 months thereafter, a Chinese version of comprehensive geriatric assessment (CGA) was conducted by the registered nurse for each participant to evaluate underlying geriatric problems and changes after daycare service (DCS). If the participants had medical, functional, and/or social difficulties, they were referred to geriatricians, dietitians, rehabilitation therapists, psychiatrists, or social workers, as appropriate.