In addition, reliable data on the prevalence of NPS is essential to inform patients และ caregivers, ascertain the overall burden of AD., และ explore underlying mechanism. Published data on the prevalence rates of NPS in AD. patients varied widely. These conflicting results may be attributed to ความไม่เหมือนกัน (heterogeneity) in the study setting, population demographics, evaluation methods or the se- verity of cognitive impairment