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Four moderately preferred edible items were identified for each participant; access to these edibles was then regulated throughout the study, to control for the number of edibles consumed.
No new items were identified for inclusion providing support for the face validity of our measure.
For the pain subscale for those with hip OA, no items were identified for DIF using the Zumbo criteria.
The greatest number of DIF items were identified for age and employment status (each with 6 items).
In addition, although redundant items were identified for mental health and functionality, they were maintained because the scale generally provided good content validity and good fit indices.
Two items were identified for exclusion ('make bed' and 'eating') and were deleted based on low factor loading, leaving 16 items for further CFA.
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for the WOMAC physical functioning subscale, using the Zumbo criteria only one item was identified for DIF by age and gender, using the SR criteria, 14 of the 17 items were identified as having DIF across the grouping factors, and using the SRbon criteria 5 DIF items were identified (see Table 4).
However, as DIF items were identified in for the WOMAC physical functioning subscale it would be advisable to analyse data taking into account the possible impact of the DIF items when weight, gender or especially age effects, are the focus of interest in UK-based osteoarthritis studies.
Using Rasch analyses, several FCI items were identified that function differently for males and females, for example (Dietz et al. 2012; Madsen, McKagan, and Sayre, 2013; Osborn Popp, Meltzer, and Megowan-Romanowicz, 2011).
Where DIF items were identified, they were removed for the relevant analysis (see statistical analysis section).
No food items were identified as risk factors for sporadic STEC cases in this study.
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CEO of Professional Science Editing for Scientists @ prosciediting.com