title: Validation of the Korean version of the EORTC QLQ-C30.
abstract: This study evaluated the Korean version of the EORTC QLQ-C30 (version 3.0) in terms of psychometric properties and its validation. One hundred and seventy patients completed three questionnaires EORTC QLQ-C30, the Beck depression inventory (BDI), and a brief pain inventory (BPI). Multitrait scaling analyses demonstrated that all scales met multidimensional conceptualization criteria, in terms of convergence and discrimination validity. Cronbach's alpha coefficients for eight multiple-item scales were greater than 0.70, with the exception of cognitive functioning. All interscale correlations were statistically significant in the expected direction (p < 0.01). Multivariate analyses showed that physical and emotional functioning were significant explanatory variables for the global quality-of-life (QOL) scale (regression coefficients: 0.36, p < 0.001; and 0.37, p < 0.001; respectively). All scales were significantly associated with pain severity and interference of the BPI, and with the cognitive-affective and somatic scales of the BDI. The emotional-functioning scale was substantially correlated with the cognitive-affective scale and somatic scale of the BDI. These results demonstrate that the Korean version of the EORTC QLQ-C30 is a valid instrument for evaluating Korean-speaking patients with cancer, and can be used to distinguish clearly between subgroups of patients of differing performance status.
authors.affiliation: Research Institute and Hospital, National Cancer Center, Goyang, Korea.
authors.forename: Y H
authors.initials: YH
authors.lastname: Yun
authors.forename: Y S
authors.initials: YS
authors.lastname: Park
authors.forename: E S
authors.initials: ES
authors.lastname: Lee
authors.forename: S M
authors.initials: SM
authors.lastname: Bang
authors.forename: D S
authors.initials: DS
authors.lastname: Heo
authors.forename: S Y
authors.initials: SY
authors.lastname: Park
authors.forename: C H
authors.initials: CH
authors.lastname: You
authors.forename: K
authors.initials: K
authors.lastname: West
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D002986:Clinical Trials as Topic; D006760:Hospitalization; D006801:Humans; D007723:Korea; D008875:Middle Aged; D009369:Neoplasms / Q000145:classification / Q000503:physiopathology / Q000523:psychology*; D011594:Psychometrics / Q000295:instrumentation*; D011788:Quality of Life; D018434:Sickness Impact Profile; D011795:Surveys and Questionnaires / Q000592:standards*