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(e.g. h1_2 = haq item one, answer level two). 2 HAQ sum scores: haq1 = dressing & grooming; haq2 = arising; haq3 = eating; haq4 = walking; haq5 = hygiene; haq6 = reach; haq 7 = grip; haq8 = activities.
A multivariate logistic regression model with patient-reported severity as an outcome (answer level minor coded as 0, and levels moderate and serious coded as 1) indicated no difference in the severity of problems between the NT and COM groups after adjusting for gender, age and the chronicity of disease.
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The participant is asked to choose from three answer levels for each dimension.
Taking into account the 5 answer levels, the test for trend was also significant (p < 0.001) in the four variables.
Nevertheless, the items for the role subscales have 5 possible answer levels in version 2 of the SF-36 instead of 2 (present/absent) in version 1.
By composing a five digit number consisting of the three answer levels on the five dimensions participants can be classified into one of 243 defined health states [ 66].
The first part of the EQ-5D-3L questionnaire consists of five questions with three possible answer levels ("no problems", "some or moderate problems" and "extreme problems") in the five dimensions mobility, self-care, usual activities, pain/discomfort, and anxiety/depression.
Merging them into one single answering level along with the option not much change did not entail any loss of information.
Regarding redistribution, 69% to 100% of the patients answering level 2 with the 3L version redistributed their responses to level 2 with the 5L version while about 9% to 22% redistributed their responses to level 3 with the 5L version.
In this chapter we discuss how to use subsystem models with different abstraction levels to answer system-level questions, make system-level trade-offs, verify system performance and discover problematic interactions.
Similarly, although without the explicit intention to propose a reduction in the number of response options, Sikkes et al. [ 26] used a simplified model with three answering levels with the objective to investigate the dimensional structure.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com