title: Reliability and validity of the Malay Version of the Breast- Impact of Treatment Scale (MVBITS) in breast cancer women undergoing chemotherapy.
abstract: BACKGROUND
  Body image dissatisfaction among breast cancer survivors has been associated with psychological stress resultant from breast cancer and resultant surgery. This study aimed to examine the psychometric properties of the Malay Version of the Breast-Impact of Treatment Scale (MVBITS) and to investigate the associations of retained factors with the Hospital Anxiety and Depression Scale (HADS) and the Rosenberg Self-Esteem Scale (RSES).
  
  
  METHODS
  The MVBITS was 'forward-backward' translated from English to Malay and then administered to 70 female breast cancer patients who came to the Oncology Clinic of University Malaya Medical Centre, Kuala Lumpur, Malaysia to undergo chemotherapy. Principal component analysis (PCA) with varimax rotation was performed to explore the factor structure of the MVBITS. Associations of retained factors were estimated with reference to Spearman correlation coefficients.
  
  
  RESULTS
  The internal consistency reliability of MVBITS was good (Cronbach's alpha 0.945) and showed temporal stability over a 3-week period. Principal component analysis suggested two factors termed as 'Intrusion' and 'Avoidance' domains. These factors explained 70.3% of the variance. Factor 1 comprised the effects of breast cancer treatment on the emotion and thought, while Factor 2 informed attempts to limit exposure of the body to self or others. The Factor 1 of MVBITS was positively correlated with total, depression and anxiety sub-scores of HADS. Factor 2 was positively correlated with total and anxiety sub-scores of HADS. MVBITS was also positively correlated with the RSES scores.
  
  
  CONCLUSIONS
  The results showed that the Malay Version of Breast-Impact of Treatment Scale possesses satisfactory psychometric properties suggesting that this instrument is appropriate for assessment of body change stress among female breast cancer patients in Malaysia.
authors.affiliation: Department of Psychological Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia. zuraida@ummc.edu.my
authors.forename: Nor Zuraida
authors.initials: NZ
authors.lastname: Zainal
authors.forename: Norley
authors.initials: N
authors.lastname: Shuib
authors.forename: Anita Zarina
authors.initials: AZ
authors.lastname: Bustam
authors.forename: Zuraida Ahmad
authors.initials: ZA
authors.lastname: Sabki
authors.forename: Ng Chong
authors.initials: NC
authors.lastname: Guan
mesh_terms: D000328:Adult; D000970:Antineoplastic Agents / Q000009:adverse effects; D001007:Anxiety / Q000209:etiology / Q000523:psychology; D001828:Body Image / Q000523:psychology*; D001943:Breast Neoplasms / Q000188:drug therapy / Q000523:psychology* / Q000601:surgery*; D003430:Cross-Sectional Studies; D003863:Depression / Q000209:etiology / Q000523:psychology; D005260:Female; D006801:Humans; D008296:Malaysia; D015412:Mastectomy, Segmental; D008875:Middle Aged; D025341:Principal Component Analysis; D011594:Psychometrics; D015203:Reproducibility of Results; D012649:Self Concept; D018709:Statistics, Nonparametric; D011795:Surveys and Questionnaires
chemical_list: D000970:Antineoplastic Agents