• Kyriaki Mystakidou, Eleni Tsilika, Efi Parpa, Irene Panagiotou, Antonis Galanos, Athanasios Gouliamos, and Maggie Watson.
• Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, University of Athens, Athens, Greece. mistakidou@yahoo.com.
• Psychooncology. 2012 Nov 1; 21 (11): 1215-21.

ObjectiveThe study aimed to assess the psychometric properties of the Cancer Locus of Control (CLOC) scale on a Greek sample of advanced cancer patients.MethodsThe 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.ResultsThe 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.ConclusionsThe 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.Copyright © 2011 John Wiley & Sons, Ltd.

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