Older people with dementia normally suffer from declined cognitive functional ability (CFA), including impaired cognition, deteriorated self-care abilities, and limited mobility. Although some games and exercises have been adopted to mitigate the harmful effects of dementia, an appropriate indoor built environment (IBE) in care and attention (C&A) homes may also play a significant and permanent role in supporting their CFA. This study aims to investigate how IBE influences the CFA of older people with dementia through the establishment of an integrated IBE–CFA model that can be used to reveal the relationships between twelve factors of three components of IBE in C&A homes (i.e., architectural design, building services, and supporting facilities) and the CFA of older people with dementia (i.e., memory loss, disorientation, confusion, self-care, and mobility). Ninety-six residents with mild or moderate dementia (tested by the Mini-Mental State Examination) in C&A homes were successfully recruited to take part in the questionnaire survey, and the data were analyzed using a series of statistical methods (i.e., a reliability test, regression analysis, and structural equation modeling). Based on the ecological theory of aging, the study found some significant relationships, including: 1) Memory loss was negatively affected by satisfaction with lifts and furniture; 2) finishes and signage had a negative impact on the disorientation of older residents with dementia; 3) dissatisfaction with finishes induced confusion in older residents with dementia; and 4) only one building services factor (temperature) positively influenced the self-care and mobility of older residents with dementia. Several practical recommendations are proposed accordingly.

老年痴呆症患者通常患有认知功能能力（CFA）下降，包括认知障碍，自我护理能力下降和活动受限。尽管已通过一些游戏和练习来减轻痴呆症的有害影响，但在护理和看护（C＆A）房屋中使用适当的室内建筑环境（IBE）在支持其CFA中也可能起着重要的永久性作用。本研究旨在通过建立集成的IBE-CFA模型来研究IBE如何影响老年痴呆症患者的CFA，该模型可用于揭示C＆A住宅中IBE的三个组成部分的十二个因素之间的关系（即建筑设计，建筑物服务和辅助设施）以及老年痴呆症患者的CFA（例如，记忆力减退，神志不清，精神错乱，自我护理和行动能力）。成功招募了96名在C＆A房屋中患有轻度或中度痴呆的居民（通过最低精神状态检查），以参与问卷调查，并使用一系列统计方法（即可靠性检验）对数据进行了分析。 ，回归分析和结构方程建模）。根据衰老的生态学理论，该研究发现了一些重要的关系，包括：1）对升降机和家具的满意度对记忆力减退产生了负面影响；2）饰面和标识对老年痴呆症患者的迷失方向有负面影响；3）老年人对老年痴呆症的不满会导致混乱；4）只有一个建筑服务因素（温度）对老年痴呆症患者的自我保健和活动产生积极影响。相应地提出了一些实用的建议。