How can we best assess the quality of life of people with dementia? The Bath Assessment of Subjective Quality of Life in Dementia (BASQID)

Purpose of the Study - The study aim was to develop a measure of self-reported QoL for people with mild to moderate dementia based on their views - the Bath Assessment of Subjective Quality of Life in Dementia (BASQID). Design and Methods - The measure was developed through multiple stages. Two field tests of the measure (n=60 & n=150) enrolled people with dementia from a memory clinic and the data were used to analyse the psychometric properties of the scale. Nested within this was a longitudinal investigation of 36 Alzheimer’s disease patients prescribed with acetylcholinesterase inhibitors. Results - The BASQID contains 14 items assessing a range of QoL issues. Results show that the BASQID satisfies the criteria of a valid, reliable, and acceptable assessment of subjective QoL. Scores were responsive to changes in QoL, over 3-months. Low association between the BASQID and Mini Mental State Examination indicates that cognitive function may influence QoL, but is an indirect measure of the QoL experienced during dementia. Implications – The BASQID provides a means of better understanding the experiences, perceptions, and beliefs of people with dementia. It does this through acknowledgement of the many influences on QoL, over and above health status. The BASQID can be used alongside objective assessments of dementia to provide a complete appraisal of a person’s QoL