Psychometric Properties of the Questionnaire on Stress in Partners of Cancer Patients.

A cancer disease can be associated with psychological stress for both patients and partners. To date, no psychometrically tested measuring instrument has been available for the assessment of cancer-specific distress in partners of cancer patients. The Questionnaire on Stress in Partners of Cancer Patients (QSC-P) was developed to close this gap. This study validates the QSC-P in two subsamples of n1 = 227 and n2 = 297 partners of cancer patients by application of exploratory factor analysis methods in n1 and confirmatory factor analysis methods in n2. Additionally, correlations with common measures of anxiety, depression, and quality of life were calculated. A cut-off for high distress was determined. A three-factor structure with 23 items that was generated in n1 could be replicated in n2. Reliability and validity analyses resulted in good to very good characteristic values of the resulting QSC-P (α = .84- .93). A cut-off of 68.5 with good sensitivity and specificity was calculated. The QSC-P proved to be a valid and reliable measuring instrument for psychological distress of partners of cancer patients and a helpful tool for clinical care and research. Future directions include development of a short-form and detailed comparison of the sexes.