Thyroid Diseases Clinical Trial
Official title:
Development and Validation of a Thyroid-Specific Quality of Life Measure
Background:
Thyroid diseases are frequent. They include both metabolic changes and gland enlargement
(goitre). Previous research and clinical suspicion indicate that the life quality of many
patients is reduced despite successful treatment. Research methods are, however, weak, and a
well-tested, disease specific quality of life questionnaire is especially needed. Several
treatment possibilities exist for each thyroid disease. For example, hypermetabolism can be
treated with either medication, radioactive iodine or by surgery. No comparative studies of
quality of life using the different treatment modalities exist.
Purpose:
To develop and evaluate a questionnaire to measure health-related quality of life in
patients suffering from thyroid diseases.
Methods:
To ensure that all relevant aspects are included, the questionnaire will be developed on the
basis of a systematic examination of the scientific literature and interviews with 13
physicians and 100 patients. The questionnaire will then be tested by 100 new patients.
After revision, the questionnaire will be answered by 1000 patients with a view to
scientifically investigate the measuring capacity of the questionnaire. This will be done
using traditional psychology methods (psychometry) as well as modern statistical methods
(structural equations for categorical data and "item response" models).
Relevance:
The above-mentioned questionnaire is necessary for clarifying whether these diseases reduce
quality of life and, in the long-term, whether a difference in quality of life exists using
the different treatment alternatives and whether treatment can be improved. It should also
be included in quality protection studies, in the evaluation of new treatment modalities and
possibly also in the treatment of the individual patient.
n/a
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