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A test of the psychometric properties of the cancer locus of control scale in Greek patients with advanced cancer

Authors


Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, University of Athens, 27 Korinthias Street, 115 26 Athens, Greece. E-mail: mistakidou@yahoo.com

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. Copyright © 2011 John Wiley & Sons, Ltd.

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