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If items from both the rumination and depressive questionnaires were entered into the same factor analysis, we could identify whether such items (ie 'depression' items from the rumination questionnaire) load better with the depressive symptom items, the rumination items, or are in fact part of a separate construct.
It is likely that majority of the participants in the study will have fatigue, and so we will try to minimise the impact that participation in the study has on their fatigue (eg, by staggering questionnaire load and providing a refreshment break during the physical assessments, offering taxi transport to the hospital).
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Data were collected using a self-administered questionnaire loaded onto an electronic data collection system and analyzed using Stata software.
22 Data were collected via a self-administered closed-ended questionnaire loaded onto an electronic data collection system using personal tablet computers.
Data were collected using an electronic questionnaire loaded in Tablet personal computers over a 2-day HCT community outreach campaign that targeted taxi ranks in the Johannesburg Metropolitan District.
The Brief WISDM is a 37-item subset of the original 68-item WISDM questionnaire, loads onto 11 motivational subscales, and has acceptable internal consistency (α = .69).69
It is noteworthy that parsimony (or simplicity) of the factors was observed, as each item of the questionnaire loaded on only one factor, with a minimum item loading of 0.45.
In our study, factor analysis was performed on the whole study population and we found that all items of the Dutch version of the KOOS questionnaire loaded on one factor.
Thus, these were removed from the analysis and a final 30-item questionnaire loaded on five distinct constructs that jointly accounted for 72.3% of variance observed (Table 2) [Additional files 1 and 2].
A final 82-item questionnaire loaded on fifteen factors and three distinct constructs as follows: Predisposing construct: 6-factors, 38-statements, Enabling constructs: 3-factors, 18-statements and Reinforcing construct: 6-factors, 26-statements that jointly accounted for 60.61% of variance observed (Tables 2, 3 and 4).
This criticism does not apply to the first and the third factor, as subscales from various questionnaires loaded on these factors.
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