European journal of oncology nursing : the official journal of European Oncology Nursing Society
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To develop and validate an instrument to collect data on symptoms (frequency/intensity) in older palliative cancer patients. ⋯ This study resulted in the development of the ASPE which reflects good properties for face- and content validity and reliability. Cognitive interviewing has a valuable contribution in the validation process. The instrument can be used to gain insight in symptoms in older palliative cancer patients.