Abstract:
OBJECTIVES:The authors evaluate a measure of the validity of utility elicitations and study the potential effects of invalid elicitations on population utility values. METHODS:The authors used a computerized survey to describe and measure preferences for three common side-effects of anti-psychotic drugs (tardive dyskinesia [TD], akathesia [AKA], pseudo-parkinsonism). The authors compared the validity of elicitations in 41 healthy volunteers to 22 schizophrenic patients. Preferences were measured using visual analog scale (VAS), pair-wise comparison (PWC), and the Standard Gamble (SG) methods. To assess the validity of each groups' responses, the authors compared the consistency of subjects' rank-order of the desirability of states across methods of preferences assessment (CAMPA). RESULTS:All healthy volunteers and 82% of patients completed the computer survey; of these subjects, 97% of healthy volunteers and 70% of patients indicated they thought they understood the task required of them. However, only 78% of healthy subjects and 44% of patients had a consistent rank ordering of preferences among VAS and PWC ratings; only 80% and 61%, respectively, had a consistent rank ordering preferences among SG and PWC ratings. For two of the three health states, inconsistent subjects had statistically higher SG utilities (for TD, 0.94 versus 0.87, and for AKA 0.92 versus 0.86; P < 0.05). CONCLUSIONS:The CAMPA test can identify potentially invalid preference ratings. Potentially invalid preference ratings may bias the "population" utilities for health states.
journal_name
Med Carejournal_title
Medical careauthors
Lenert LA,Morss S,Goldstein MK,Bergen MR,Faustman WO,Garber AMdoi
10.1097/00005650-199709000-00004subject
Has Abstractpub_date
1997-09-01 00:00:00pages
915-20issue
9eissn
0025-7079issn
1537-1948journal_volume
35pub_type
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