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Other participants struggled with the conceptual basis of items regarding pain.
The ROC curves were calculated on the basis of items with significant results in the regression analysis for AS, early axial SpA and the whole group of axial SpA.
The level of uncooperativeness and lack of judgment and insight at admission were determined on the basis of items G8 and G12 of the Positive and Negative Syndrome Scale (PANSS) [ 21].
The HeartQoL is a new questionnaire developed on the basis of items from three widely used questionnaires for specific groups of cardiac patients (the Seattle Angina Questionnaire, the MacNew Heart Disease Health-related Quality of Life Questionnaire and the Minnesota Living with Heart Failure Questionnaire).
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The test score for economic knowledge and skills was analysed and built on the basis of item response theory (IRT) using the software program "ConQuest" (Wu et al. 2007).
The research team deleted five items and amalgamated two items on the basis of item analysis and conceptual discussion, as well as making some final wording changes.
Like parametric forms of IRT, Mokken scales which are assumed to be unidimensional [ 1] select items that form hierarchies on the basis of item difficulty.
Based on patient interviews, focus groups, piloting and follow-up interviews, instrument development ensured that the views of patients with knee problems formed the basis of item construction.
The current version is a long list, consisting of 60 items covering four sub-scales (facial expressions; activity/body movements; social/personality/mood; physiological/eating/sleeping/vocal), which were composed on the basis of item analysis.
This is an important point which suggests that test or aggregated statistics like mean facility or discrimination should not form the basis of item writing or test construction policies alone.
Items were removed if they loaded on more than one domain (above 0.4 for each domain) or on the basis of high item-item correlations (above 0.9) [ 29].
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