Reliability and validity of a new scale on internal coherence (ICS) of cancer patients
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Reliability and validity of a new scale on internal coherence (ICS) of cancer patients Matthias Kröz1,2, Arndt Büssing*3, Hans Broder von Laue4, Marcus Reif5, Gene Feder6, Friedemann Schad1,2, Matthias Girke1,2 and Harald Matthes1,2 Address: 1Havelhöhe Research Institute (FIH) at the Community Hospital Havelhöhe, Kladower Damm 221, 14089 Berlin, Germany, 2Department of Internal Medicine, Community Hospital Havelhöhe, Kladower Damm 221, 14089 Berlin, Germany, 3Chair of Medical Theory and Complementary Medicine, University of Witten/Herdecke, Gerhard-Kienle-Weg 4, 58313 Herdecke, Germany, 4Oncological Practice, Öschelbronn, Am Eichhof 30, 75223 Niefern-Öschelbronn, Germany, 5Institute for Clinical Research (IKF), Hardenbergstr. 19, 10623 Berlin Germany and 6Unit of academic primary health care, Bristol University, 25 Belgrave Road Bristol BS8 2AA, UK Email: Matthias Kröz - [email protected]; Arndt Büssing* - [email protected]; Hans Broder von Laue - [email protected]; Marcus Reif - [email protected]; Gene Feder - [email protected]; Friedemann Schad - [email protected]; Matthias Girke - [email protected]; Harald Matthes - [email protected] * Corresponding author
Published: 24 June 2009 Health and Quality of Life Outcomes 2009, 7:59
doi:10.1186/1477-7525-7-59
Received: 13 March 2009 Accepted: 24 June 2009
This article is available from: http://www.hqlo.com/content/7/1/59 © 2009 Kröz et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract Background: Current inventories on quality of life used in oncology mainly focus on functional aspects of patients in the context of disease adaption and treatments (side) effects (EORTC QLQ C30) or generically the status of common functions (Medical Outcome Study SF 36). Beyond circumscribed dimensions of quality of life (i.e., physical, emotional, social, cognitive etc.), there is a lack of inventories which also address other relevant dimensions such as the 'sense of coherence' (SOC) in cancer patients. SOC is important because of its potential prognostic relevance in cancer patients, but the current SOC scale has mainly been validated for psychiatric and psychosomatic patients. Our two-step validation study addresses the internal coherence (ICS) scale, which is based on expert rating, using specific items for oncological patients, with respect to its reliability, validity and sensitivity to chemotherapy. Methods: The items were tested on 114 participants (57 cancer patients and a matched control group), alongside questions on autonomic regulation (aR), the Hospital Anxiety and Depression Scale (HADS), self-regulation (SRQ) and Karnofsky the Performance-Index (KPI). A retest of 65 participants was carried out after a median time span of four weeks. In the secon
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