title: Impact of the recall period on measuring health utilities for acute events.
abstract: The impact of healthcare interventions on health utility values is most frequently measured using a preference-based instrument. Each of the available instruments instructs the respondent to report their health status over different recall periods ranging from the current day to the past month. In an ongoing randomised controlled trial in patients with advanced HIV disease, the impact of using a preference-based instrument with a 1-week recall period vs a 1-day recall period (e.g. today) for capturing recently resolved serious adverse events was measured. The results suggest that the instrument with a 1-week recall period gave lower utility values for recently resolved events in comparison with the instrument with a 1-day recall period. A plausible interpretation of these results is that the recall period was adhered to; for example, patients ignored the impact of recently resolved events in their response if the questionnaire asked them only about their health today. While there are limitations to our study, we believe further consideration should be given to the recall period used for preference-based instruments, and future research should examine other patient groups using a single instrument with multiple recall periods.
authors.affiliation: Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital, Vancouver, BC, Canada.
authors.forename: Nick
authors.initials: N
authors.lastname: Bansback
authors.forename: Huiying
authors.initials: H
authors.lastname: Sun
authors.forename: Daphne P
authors.initials: DP
authors.lastname: Guh
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Bohdan
authors.initials: B
authors.lastname: Nosyk
authors.forename: Susan
authors.initials: S
authors.lastname: Griffin
authors.forename: Paul G
authors.initials: PG
authors.lastname: Barnett
authors.forename: Aslam H
authors.initials: AH
authors.lastname: Anis
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000628:therapy*; D000328:Adult; D005260:Female; D019538:Health Care Surveys; D006801:Humans; D008297:Male; D011939:Mental Recall; D008875:Middle Aged; D010342:Patient Acceptance of Health Care; D012044:Regression Analysis; D011795:Surveys and Questionnaires