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Quality of life – conceptualization and special characteristics related to oral heath

Quality of life is a multidimensional concept and its measurement is very important both for clinical decisions and for allocation of resources for health interventions. This paper reviews the literature and discusses the major issues regarding the development of instruments that could measure a patient’s quality of life. The aim of the review is to provide basic information and analysis concerning the development of a health status assessment instrument from a psychometric perspective. The questionnaires are the most common instrument and the paper discusses the basic characteristics of a good one. The reliability and validity of a questionnaire are detailed, describing also methods to evaluate them.