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- Title
Comparing different experimental designs for best-worst scaling choice experiments: the case of asthma control.
- Authors
Najafzadeh, Mehdi; Ungar, Wendy J.; Hadioonzadeh, Anahita; Tsao, Nicole; Lynd, Larry D.
- Abstract
Best-worst scaling (BWS) experiments are useful for assessing preferences for health treatments. The objective was to compare the effects of an orthogonal main effects plan (OMEP) experimental design to a balanced incomplete block design [BIBD]) on preferences for pediatric asthma control. Five attributes were included in separate OMEP and BIBD questionnaires: Night-time symptoms, Wheezing or tightening of chest, Changing medication, Emergency visits, and Participation in physical activities. Convenience samples of parents with a child with asthma and adolescents with asthma recruited in Toronto, Canada, were randomly assigned to BIBD or OMEP. Preference weights were compared using conditional logit regression. Spearman's rank order test was used to assess agreement between the order of preference weights between the two designs. A total of 96 and 101 respondents completed the OMEP and BIBD questionnaires, respectively. Substantial agreement was observed between the order of preference weights in the two designs (p_Spearman=0.925; p-value<0.0001). Some differences were observed in the magnitude of preference weights with BIBD coefficients demonstrating a wider range within attributes compared to OMEP. In both designs, no Night time symptoms was the most preferred and ten Emergency room visits the least preferred attribute level. Preferences for different levels of Changing Medication had the smallest variation in both designs. The results suggest that using BIBD instead of OMEP for designing Case 2 BWS experiments may result in small but significant differences in preference estimates.
- Subjects
CANADA; ASTHMA prevention; CHI-squared test; CONFIDENCE intervals; DECISION making; EXPERIMENTAL design; FISHER exact test; HEALTH attitudes; HOSPITAL emergency services; MEDICAL appointments; QUESTIONNAIRES; RESEARCH funding; RESPIRATORY organ sounds; STATISTICAL sampling; STATISTICS; T-test (Statistics); TIME; DATA analysis; MULTIPLE regression analysis; SYMPTOMS; PHYSICAL activity; DATA analysis software; PATIENTS' attitudes; DESCRIPTIVE statistics; ODDS ratio; CHILDREN
- Publication
International Journal of Health Preference Research (IJHPR) / Revue Internationale de Recherche sur les Préférences en Santé, 2018, p3
- ISSN
2371-5529
- Publication type
Article
- DOI
10.21965/IJHPR.2018.001