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Paiva, Maria Adelaide

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  • Interpretation of many-valuedness in quality-of-life instruments
    Publication . Ribeiro, Luís Pedro; Eklund, Patrik; Gomes Alves Ferreira, Maria Augusta; Magalhães Ribeiro, Anabela de; Farinha, Maria Conceição; Paiva, Maria Adelaide; Gonçalves, Tânia; de Almeida Fontes, Ana Paula; Pinheiro, João
    Assessment instruments for functioning in general and quality of life in particular often involve discrete scales with three, four, or five values, or Visual Analogue Scales (VAS) with a range 0–100. VAS scales often need to be downsized and discretized using intervals or clusters. Cutoff points for these intervals/clusters need to be carefully selected and justified. Our objective was to underline the importance of providing clear interpretations of many-valuedness appearing in quality-of-life (QoL) instruments, and to present a methodology for the provision of such clearness. Doing so, we view QoL scales as originating within the World Health Organization (WHO).