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Article
Estimating anchor-based minimal important change using longitudinal confirmatory factor analysis
The minimal important change (MIC) is defined as the smallest within-individual change in a patient-reported outcome measure (PROM) that patients on average perceive as important. We describe a method to estim...
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Article
Open AccessEstimating meaningful thresholds for multi-item questionnaires using item response theory
Meaningful thresholds are needed to interpret patient-reported outcome measure (PROM) results. This paper introduces a new method, based on item response theory (IRT), to estimate such thresholds. The performa...
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Article
Open AccessDevelopment of the SF-6Dv2 health utility survey: comprehensibility and patient preference
The SF-6Dv2 classification system assesses health states in six domains—physical functioning, role function, bodily pain, vitality, social functioning, and mental health. Scores have previously been derived fr...
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Article
Open AccessThe development and validation of a revised version of the Medical Outcomes Study Sleep Scale (MOS Sleep-R)
The 12-item Medical Outcomes Study Sleep Scale (MOS Sleep Scale) has been used to capture patient-reported sleep problems in hundreds of studies. A revised version of the MOS Sleep Scale (MOS Sleep-R) was deve...
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Article
Open Access“Development in well-being and social function among Danish hemophilia patients with HIV: a three-wave panel study spanning 24 years”
Between 1975 and 1985 a total of 91 Danish patients with moderate and severe hemophilia (PWH) was infected with HIV constituting a major scandal in the Danish health care system. This study describes the burde...
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Article
Open AccessState of the psychometric methods: comments on the ISOQOL SIG psychometric papers
Psychometric analyses of patient reported outcomes typically use either classical test theory (CTT), item response theory (IRT), or Rasch measurement theory (RTM). The three papers from the ISOQOL Psychometric...
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Article
Open AccessA meta-analytic review of measurement equivalence study findings of the SF-36® and SF-12® Health Surveys across electronic modes compared to paper administration
Patient-reported outcome (PRO) measures originally developed for paper administration are increasingly being administered electronically in clinical trials and other health research studies. Three published me...
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Article
Open AccessVarying the item format improved the range of measurement in patient-reported outcome measures assessing physical function
Physical function (PF) is a core patient-reported outcome domain in clinical trials in rheumatic diseases. Frequently used PF measures have ceiling effects, leading to large sample size requirements and low se...
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Article
Open AccessInfluence of lifestyle factors on long-term sickness absence among female healthcare workers: a prospective cohort study
While previous research has indicated that unhealthy lifestyle is associated with sickness absence, this association may be confounded by occupational class. To avoid this potential confounding, we examined th...
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Article
Difference in method of administration did not significantly impact item response: an IRT-based analysis from the Patient-Reported Outcomes Measurement Information System (PROMIS) initiative
To test the impact of method of administration (MOA) on the measurement characteristics of items developed in the Patient-Reported Outcomes Measurement Information System (PROMIS).
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Article
Open AccessDevelopment and evaluation of a crosswalk between the SF-36 physical functioning scale and Health Assessment Questionnaire disability index in rheumatoid arthritis
The SF-36 physical functioning scale (PF-10) and the Health Assessment Questionnaire disability index (HAQ-DI) are the most frequently used instruments for measuring self-reported physical function in rheumato...
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Article
Open AccessPsychosocial work environment factors and weight change: a prospective study among Danish health care workers
Lifestyle variables may serve as important intermediate factors between psychosocial work environment and health outcomes. Previous studies, focussing on work stress models have shown mixed and weak results in...
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Article
Development of an item bank and computer adaptive test for role functioning
Role functioning (RF) is a key component of health and well-being and an important outcome in health research. The aim of this study was to develop an item bank to measure impact of health on role functioning.
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Article
Assessing the factor structure of a role functioning item bank
Role functioning (RF) is an important part of health-related quality of life, but is hard to measure due to the wide definition of roles and fluctuations in role participation. This study aims to explore the d...
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Article
Health and role functioning: the use of focus groups in the development of an item bank
Role functioning is an important part of health-related quality of life. However, assessment of role functioning is complicated by the wide definition of roles and by fluctuations in role participation across ...
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Article
Open AccessDevelopment of physical and mental health summary scores from the patient-reported outcomes measurement information system (PROMIS) global items
The use of global health items permits an efficient way of gathering general perceptions of health. These items provide useful summary information about health and are predictive of health care utilization and...
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Article
IRT health outcomes data analysis project: an overview and summary
In June 2004, the National Cancer Institute and the Drug Information Association co-sponsored the conference, “Improving the Measurement of Health Outcomes through the Applications of Item Response Theory (IRT...
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Article
Development and evaluation of a computer adaptive test for ‘Anxiety’ (Anxiety-CAT)
Within the framework of item response theory (IRT), we developed a German version of an item bank, as well as a software application that can be employed to measure anxiety by means of a computer adaptive test...
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Article
Item Response Theory Methods can Improve the Measurement of Physical Function by Combining the Modified Health Assessment Questionnaire and the SF-36 Physical Function Scale
To compare the measurement properties of the Modified Health Assessment Questionnaire [MHAQ], the SF-36® Health Survey 10 item Physical Functioning scale [PF10], and scores from an item response theory (IRT) base...
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Article
Multidimensional Computerized Adaptive Testing of the EORTC QLQ-C30: Basic Developments and Evaluations
Objective: Self-report questionnaires are widely used to measure health-related quality of life (HRQOL). Ideally, such questionnaires should be adapted to the individual patient and at the same time scores should...
