Clinical relevance of single item quality of life indicators in cancer clinical trials

British Journal of Cancer
J BernhardC M Rudenstam

Abstract

We investigated the hypothesis that global single-item quality-of-life indicators are less precise for specific treatment effects (discriminant validity) than multi-item scales but similarly efficient for overall treatment comparisons and changes over time (responsiveness) because they reflect the summation of the individual meaning and importance of various factors. Linear analogue self-assessment (LASA) indicators for physical well-being, mood and coping were compared with the Hospital Anxiety and Depression Scale (HAD), the Mood Adjective Check List (MACL) and the emotional behaviour and social interaction scales of the Sickness Impact Profile (SIP) in 84 patients with early breast cancer receiving adjuvant therapy. Discriminant validity was investigated by multitrait-multimethod correlation, responsiveness by standardized response mean (SRM). Discriminant validity of the indicators was present at baseline but less under treatment. Responsiveness was demonstrated by the expected pattern among treatments (P = 0.008). In patients without chemotherapy, the SRMs indicated moderate (0.5-0.8) to large (>0.8) improvements in physical well-being (0.70), coping (0.92), HAD anxiety (0.89) and depression (1.19), and MACL mental well-be...Continue Reading

Citations

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