Abstract
Choosing a measure instrument for a study raises the question of whether instruments designed for the same purpose produce the same results. We investigated this question for two instruments designed to measure subjective quality of life (QOL) in cancer clinical trials: the Functional Living Index-Cancer (FLIC) and the Quality of Life Questionnaire Core module (QLQ-C30). These were administered concurrently to 98 cancer patients. Four patient groups were defined: (1) well, no chemotherapy (n = 23); (2) adjuvant chemotherapy (n = 24); (3) stable disease, active chemotherapy (n = 24); (4) progressive disease (n = 27). Both instruments have global, role, social, emotional, pain, and nausea scales; QLQ-C30 also assesses physical function, cognitive function, and fatigue, while FLIC assesses hardship. Correlation analysis indicated convergent validity for the global, role, emotional, pain and nausea dimensions, but not the social dimension. Both instruments indicated that groups 1 and 2 had better QOL than group 4 in at least one dimension. However, different dimension-specific results meant that qualitatively different conclusions would have been drawn if either instrument had been used singly: FLIC indicated that group 1 had bette...Continue Reading
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