title: A test of the psychometric properties of the cancer locus of control scale in Greek patients with advanced cancer.
abstract: OBJECTIVE
  The study aimed to assess the psychometric properties of the Cancer Locus of Control (CLOC) scale on a Greek sample of advanced cancer patients.
  
  
  METHODS
  The scale was translated with the forward-backward procedure to Greek. The CLOC scale was administered to 140 advanced cancer patients. It was administered twice, with a 3-day interval, to 100 (of the 140) eligible patients with advanced cancer. Together with the CLOC scale, the patients also completed the Greek Mental Adjustment to Cancer (G-MAC) scale. Confirmatory factor analysis was carried out using the AMOS 7.0 analysis. The reliability was assessed by the internal consistency (Cronbach's α coefficients), test-retest (Spearman's r value) of the instrument, and inter-item correlations. Construct validity was assessed using the G-MAC scale, interscale correlations, item-scale correlations, and scales-total correlations.
  
  
  RESULTS
  The homogeneity of the subscales proved to be satisfactory (α coefficient ranged from 0.713 to 0.786). Overall test-retest reliability was satisfactory at p < 0.0005. Construct validity has shown moderate correlations with G-MAC p < 0.0005. Interscale and inter-item correlations were satisfactory at p < 0.05.
  
  
  CONCLUSIONS
  The results suggest that the Greek version of CLOC administered in cancer patients treated in a palliative care unit is a reliable and valid clinical instrument.
authors: Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, University of Athens, Athens, Greece. mistakidou@yahoo.com.
authors: Kyriaki
authors: K
authors: Mystakidou
authors: Eleni
authors: E
authors: Tsilika
authors: Efi
authors: E
authors: Parpa
authors: Irene
authors: I
authors: Panagiotou
authors: Antonis
authors: A
authors: Galanos
authors: Athanasios
authors: A
authors: Gouliamos
authors: Maggie
authors: M
authors: Watson
mesh_terms: D000223:Adaptation, Psychological; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005163:Factor Analysis, Statistical; D005260:Female; D006115:Greece; D006801:Humans; D007389:Internal-External Control; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D009369:Neoplasms / Q000523:psychology*; D010166:Palliative Care; D011594:Psychometrics / Q000379:methods*; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires; D014175:Translating