Mortality in patients with behavioural and psychological symptoms of dementia: a registry-based study

This study of 11,448 individuals was based on linked information from the Swedish BPSD registry, the National Patient Register and the Cause of Death register. BPSD was assessed with the Neuropsychiatric Inventory (NPI). Cox proportional hazards regressions were performed for survival analysis. To study different degrees of BPSD, data was categorized into groups: no (NPI, 0 points), mild (NPI, 1–3 points on ≥1 item), moderate (NPI, 4–8 points on ≥1 item) and severe (NPI, 9–12 points on ≥1 item) BPSD based on the highest score on any of the BPSD assessed (NPI items).