title: Cross-cultural application of the Korean version of the EORTC QLQ-ELD14 questionnaire for elderly patients with cancer.
abstract: OBJECTIVE
  The European Organization for Research and Treatment of Cancer (EORTC) QLQ-ELD14 is a validated tool that measures Health-related Quality-of-life (HRQOL) for elderly patients with cancer. This study was conducted to evaluate the psychometric properties of the Korean version of the EORTC QLQ-ELD14 to determine if this tool can be used to evaluate HRQOL for older Korean patients with cancer.
  
  
  METHODS
  We recruited 439 elderly patients with cancer aged ≥60years from 11 cancer centers and completed the EORTC QLQ-ELD14 questionnaires. The reliability and validity of the EORTC QLQ-ELD14 questionnaire were assessed via Cronbach alpha, multitrait scaling analyses, correlation analyses with the EORTC QLQ-C30, and known-group comparisons. Known-group comparisons were conducted by dividing the patients into groups based on the cancer stage, depression level, and loss of mobility.
  
  
  RESULTS
  The scale structure of the Korean version of the EORTC QLQ-ELD14 was consistent with the originally hypothesized scale structure. Cronbach alpha coefficients ranged 0.65-0.88. Multitrait scaling analysis showed good item convergent and discriminant validity. Low scaling errors (3.1%) were observed. Divergent validity was demonstrated by no strong correlation with the EORTC QLQ C30. The clinical validity of the Korean version of the EORTC QLQ-ELD14 was demonstrated by its ability to discriminate among patient subgroups categorized by AJCC stage, depression level, and loss of mobility.
  
  
  CONCLUSIONS
  Our findings indicate that the Korean version of the EORTC QLQ-ELD14 questionnaire is reliable and valid for measuring QOL of older Korean patients with cancer.
authors.affiliation: Department of Family Medicine, National Center for Mental Health, Seoul, Republic of Korea.
authors.forename: Ae Jin
authors.initials: AJ
authors.lastname: Goo
authors.affiliation: Department of Family Medicine, Samsung Medical Center, Supportive Care Center, Samsung Comprehensive Cancer Center, Seoul, Republic of Korea. Electronic address: dongwook.shin@samsung.com.
authors.forename: Dong Wook
authors.initials: DW
authors.lastname: Shin
authors.affiliation: Cancer Policy Branch, National Cancer Center, Goyang, Republic of Korea.
authors.forename: Hyung Kook
authors.initials: HK
authors.lastname: Yang
authors.affiliation: Cancer Policy Branch, National Cancer Center, Goyang, Republic of Korea; College of Medicine/Graduate School of Health Science Business Convergence, Chungbuk National University, Cheongju, Republic of Korea.
authors.forename: Jong-Hyock
authors.initials: JH
authors.lastname: Park
authors.affiliation: Cancer Policy Branch, National Cancer Center, Goyang, Republic of Korea; College of Medicine/Graduate School of Health Science Business Convergence, Chungbuk National University, Cheongju, Republic of Korea.
authors.forename: So-Young
authors.initials: SY
authors.lastname: Kim
authors.affiliation: Department of Counseling Psychology, Hanyang Cyber University, Seoul, Republic of Korea.
authors.forename: Joo Yeon
authors.initials: JY
authors.lastname: Shin
authors.affiliation: Cancer Policy Branch, National Cancer Center, Goyang, Republic of Korea.
authors.forename: Young Ae
authors.initials: YA
authors.lastname: Kim
authors.affiliation: Department of Preventive Medicine, College of Medicine, Pusan National University, Pusan, Republic of Korea.
authors.forename: Changhoon
authors.initials: C
authors.lastname: Kim
authors.affiliation: Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Republic of Korea.
authors.forename: Nam-Soo
authors.initials: NS
authors.lastname: Hong
authors.affiliation: Department of Hematology and Oncology, Ulsan University Hospital, Ulsan, Republic of Korea.
authors.forename: Young Joo
authors.initials: YJ
authors.lastname: Min
authors.affiliation: Cancer Policy Branch, National Cancer Center, Goyang, Republic of Korea. Electronic address: khparkmd@ncc.re.kr.
authors.forename: Keeho
authors.initials: K
authors.lastname: Park
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D003431:Cross-Cultural Comparison; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000523:psychology*; D011594:Psychometrics; D011788:Quality of Life; D015203:Reproducibility of Results; D056910:Republic of Korea; D057566:Self Report / Q000592:standards*; D014177:Translations
keywords: Cancer; EORTC-QLQ-ELD14; Elderly; Korean; Oncology; Validation