Janwillem W H Kocks

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BACKGROUND Patient-reported outcomes (PRO) questionnaires are being increasingly used in COPD clinical studies. The challenge facing investigators is to determine what change is significant, ie what is the minimal clinically important difference (MCID). This study aimed to identify the MCID for the clinical COPD questionnaire (CCQ) in terms of patient(More)
BACKGROUND Questionnaires are often used in assessing health-related quality of life in patients with chronic obstructive pulmonary disease (COPD). It is important that these questionnaires have good reliability, validity, and responsiveness. The aim of this study was to investigate and compare these properties in the disease specific Clinical COPD(More)
BACKGROUND There is a growing interest to use health status or disease control questionnaires in routine clinical practice. However, the validity of most questionnaires is established using techniques developed for group level validation. This study examines a new method, using patient interviews, to validate a short health status questionnaire, the(More)
OBJECTIVES To develop a model to predict EuroQol five-dimensional questionnaire (EQ-5D) values from clinical chronic obstructive pulmonary disease (COPD) questionnaire (CCQ) scores. METHODS We used data from three clinical trials (the Randomized Clinical Trial on Effectiveness of Integrated COPD Management in Primary Care [RECODE], the Assessment Of Going(More)
BACKGROUND Health status provides valuable information, complementary to spirometry and improvement of health status has become an important treatment goal in COPD management. We compared the usefulness and validity of the COPD Assessment Test (CAT) and the Clinical COPD Questionnaire (CCQ), two simple questionnaires, in comparison with the St. George(More)
BACKGROUND A major goal in the management of chronic obstructive pulmonary disease (COPD) is to ensure that the burden of the disease for patients with COPD is limited and that patients will have the best possible quality of life. AIMS To explore all the possible factors that could influence disease-specific quality of life and health status in patients(More)
BACKGROUND The Control of Allergic Rhinitis and Asthma Test (CARAT) monitors control of asthma and allergic rhinitis. AIMS To determine the CARAT's minimal clinically important difference (MCID) and to evaluate the psychometric properties of the Dutch CARAT. METHODS CARAT was applied in three measurements at 1-month intervals. Patients diagnosed with(More)
OBJECTIVE To investigate the influence of the general practitioner's style of clothing on the patient's level of confidence in that doctor; is vanity a functional attribute for the GP? DESIGN Experimental comparative study. METHOD 4 photographic models representing 4 types of GP, namely the older male, younger male, older female and younger female GP,(More)
AIM Guidelines advocate that improvement in functional status should be a major goal in COPD treatment. Many tools are available to assess aspects of functional status. This review aims to categorize systematically the available tools based on their construct (i.e. what the tool intends to measure) and to rate the tools for use in the primary care setting.(More)
In the majority of cases, asthma and chronic obstructive pulmonary disease (COPD) are two clearly distinct disease entities. However, in some patients there may be significant overlap between the two conditions. This constitutes an important area of concern because these patients are generally excluded from randomised controlled trials (mostly because of(More)