title: Mapping the functional assessment of cancer therapy-breast (FACT-B) to the 5-level EuroQoL Group's 5-dimension questionnaire (EQ-5D-5L) utility index in a multi-ethnic Asian population.
abstract: OBJECTIVE
  To develop an algorithm for mapping the Functional Assessment of Cancer Therapy-Breast (FACT-B) to the 5-level EuroQoL Group's 5-dimension questionnaire (EQ-5D-5L) utility index.
  
  
  METHODS
  A survey of 238 breast cancer patients in Singapore was conducted. Models using various regression methods with or without recognizing the upper boundary of utility values at 1 were fitted to predict the EQ-5D-5L utility index based on the five subscale scores of the FACT-B. Data from a follow-up survey of these patients were used to validate the results.
  
  
  RESULTS
  A model that maps the physical, emotional, functional well-being and the breast cancer concerns subscales of the FACT-B to the EQ-5D-5L utility index was derived. The social well-being subscale was not associated to the utility index. Although theoretical assumptions may not be valid, ordinary least square outperformed other regression methods. The mean predicted utility index within each performance status level at follow-up deviated from the observed mean less than the minimally important difference of EQ-5D for cancer patients.
  
  
  CONCLUSIONS
  The mapping algorithm converts the FACT-B to the EQ-5D utility index. This enables oncologists, clinical researchers and policy makers to obtain a quantitative utility summary of a patient's health status when only the FACT-B is assessed.
authors.forename: Yin Bun
authors.initials: YB
authors.lastname: Cheung
authors.forename: Nan
authors.initials: N
authors.lastname: Luo
authors.forename: Raymond
authors.initials: R
authors.lastname: Ng
authors.affiliation: Center for Quantitative Medicine, Duke-NUS Graduate Medical School, College Road, Singapore 169857, Singapore. chunfanlee8128@gmail.com.
authors.forename: Chun Fan
authors.initials: CF
authors.lastname: Lee
mesh_terms: D000328:Adult; D000465:Algorithms; D044466:Asian People / Q000523:psychology; D001943:Breast Neoplasms / Q000523:psychology*; D002681:China / Q000208:ethnology; D003625:Data Collection; D005006:Ethnicity / Q000523:psychology*; D005260:Female; D006304:Health Status; D006801:Humans; D007194:India / Q000208:ethnology; D008296:Malaysia / Q000208:ethnology; D008875:Middle Aged; D008960:Models, Psychological; D011788:Quality of Life / Q000523:psychology*; D012044:Regression Analysis; D012846:Singapore; D058992:Social Participation; D011795:Surveys and Questionnaires; D044465:White People / Q000523:psychology