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The importance of patient-reported outcomes such as health-related quality of life (HRQL) in clinical research is increasingly acknowledged. In order to yield valid results, the measurement properties of HRQL questionnaires must be thoroughly investigated. One aspect of such a validation process is the demonstration of content validity, i.e. that the(More)
We used general population data (n = 4084) to examine data completeness, response consistency, tests of scaling assumptions, and reliability of the Danish SF-36 Health Survey. We compared traditional multitrait scaling analyses to analyses using polychoric correlations and Spearman correlations. The frequency of missing values was low, except for elderly(More)
OBJECTIVE To measure the levels of fatigue in the general population, and to examine how disease and sociodemographic factors influence fatigue. DESIGN Cross sectional questionnaire study in the Danish general population. SUBJECTS A random, age stratified sample of 1608 people aged 20-77 with an equal gender distribution (response rate 67%). MAIN(More)
BACKGROUND Appropriate scale validity and internal consistency reliability have recently been documented for the new thyroid-specific quality of life (QoL) patient-reported outcome (PRO) measure for benign thyroid disorders, the ThyPRO. However, before clinical use, clinical validity and test-retest reliability should be evaluated. AIM To investigate(More)
To establish a reliable and valid scale structure of a patient-reported outcome measuring thyroid-specific quality of life. The 98-item ThyPRO questionnaire was administered to patients with benign thyroid diseases at two university hospitals. Multi-trait scaling was performed, evaluating lack of convergent validity (item-own scale polyserial correlation(More)
Background: The main objective of this study was to investigate the construct validity of the WHOQOL-BREF by use of Rasch and Item Response Theory models and to examine the stability of the model across high/low scoring individuals, gender, education, and depressive illness. Furthermore, the objective of the study was to estimate the reference data for the(More)
BACKGROUND The aim of this study was to examine the course of poststroke fatigue in a cohort of first-time stroke patients compared to the general population, and to identify clinically relevant features of post-stroke fatigue. METHODS We performed a follow-up study of 165 patients with first-time stroke admitted to acute stroke units at the Aarhus(More)
OBJECTIVE Our objective was to describe body composition, lipid profile, and health-related quality of life (HRQL) in patients with traumatic brain injury (TBI) in relation to the development of posttraumatic hypopituitarism. DESIGN This is a cross-sectional evaluation with a nested prospective substudy. PATIENTS The cross-sectional cohort included 104(More)
BACKGROUND The use of levothyroxine to treat subclinical hypothyroidism is controversial. We aimed to determine whether levothyroxine provided clinical benefits in older persons with this condition. METHODS We conducted a double-blind, randomized, placebo-controlled, parallel-group trial involving 737 adults who were at least 65 years of age and who had(More)
To evaluate the extent of differential item functioning (DIF) within the thyroid-specific quality of life patient-reported outcome measure, ThyPRO, according to sex, age, education and thyroid diagnosis. A total of 838 patients with benign thyroid diseases completed the ThyPRO questionnaire (84 five-point items, 13 scales). Uniform and nonuniform DIF were(More)