The rising number of dementia diagnoses and imminent adoption of disease-modifying treatments necessitate innovative approaches to identify individuals at risk, monitor disease course and intervene non-pharmacologically earlier in the disease course. Digital assessments of dementia risk and cognitive function have the potential to outperform traditional in-person assessments in terms of their affordability, accuracy and longitudinal tracking abilities. However, their accessibility and reliability in older adults is unclear.

To evaluate the usability and reliability of a smartphone assessment of lifestyle and cognitive factors relevant to dementia risk in a group of UK-based older adults.

Cognitively healthy adults (n = 756) recruited through the Dementias Platform UK Great Minds volunteer register completed three assessments of cognitive function and dementia risk over a 3-month period and provided usability feedback on the Five Lives smartphone application (app). We evaluated cognitive test scores for age, gender and higher education effects, normality distributions, test–retest reliability and their relationship with participants’ lifestyle dementia risk factors.

Participants found the app ‘easy to use’, ‘quick to complete’ and ‘enjoyable’. The cognitive tests showed normal or near-to-normal distributions, variable test–retest reliabilities and age-related effects. Only tests of verbal ability showed gender and education effects. The cognitive tests did not correlate with lifestyle dementia risk scores.

The Five Lives assessment demonstrates high usability and reliability among older adults. These findings highlight the potential of digital assessments in dementia research and clinical practice, enabling improved accessibility and better monitoring of cognitive health on a larger scale than traditional in-person assessments.

痴呆症诊断数量的不断增加以及疾病缓解治疗的即将采用，需要创新的方法来识别高危个体、监测病程并在病程早期进行非药物干预。痴呆症风险和认知功能的数字评估在负担能力、准确性和纵向跟踪能力方面有可能超越传统的面对面评估。然而，它们在老年人中的可及性和可靠性尚不清楚。

旨在评估智能手机评估与一组英国老年人痴呆风险相关的生活方式和认知因素的可用性和可靠性。

通过英国痴呆症平台 Great Minds 志愿者注册招募的认知健康成年人 (n = 756) 在 3 个月的时间内完成了三项认知功能和痴呆症风险评估，并提供了有关 Five Lives 智能手机应用程序 (app) 的可用性反馈。我们评估了认知测试分数的年龄、性别和高等教育影响、正态分布、重测可靠性及其与参与者生活方式痴呆风险因素的关系。

参与者认为该应用程序“易于使用”、“快速完成”和“令人愉快”。认知测试显示正态或接近正态分布、可变的重测可靠性和年龄相关效应。只有言语能力测试显示了性别和教育的影响。认知测试与生活方式痴呆风险评分无关。

五种生命评估显示了老年人的高可用性和可靠性。这些发现凸显了数字评估在痴呆症研究和临床实践中的潜力，与传统的面对面评估相比，能够在更大范围内提高可及性并更好地监测认知健康状况。