GDS = Geriatric Depression Scale; EQ-5D = European Quality of Life-5 Dimensions; QWB = Quality of Well-Being Index; VAS = Global Quality of Life Visual Analog Scale; QOL-AD = Quality of Life-Alzheimer’s Disease.
For each quality of life outcome variable, the regression coefficients were calculated from four fully adjusted regression models. Each regression analysis was adjusted for patient age, sex, marital status, first language, Charlson score, Alzheimer’s Disease Assessment Scale-Cognitive Subscale, Disability Assessment for Dementia, Neuropsychiatric Inventory and study center, as well as for the other GDS sub-scale variables. The QOL-AD scores were normalized to a 0–1 scale. The degrees of freedom for calculating the 95% confidence intervals ranged from 288 to 291.