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To assess the data quality of two approaches to scaling items within the Patient Experiences Questionnaire (PEQ); a five-point scale with descriptors for all scale points and a 10-point scale with descriptors only at the end points.
In each case reliability was assessed with Cronbach's Alpha to justify scaling items along these lines.
Reliability estimates for visual analog scaling items range from 0.40 to 0.95 [ 11], and these estimates compare favorably with those for other scales [ 12, 13].
For scaling, items were reverse-scored (where necessary); all items then summed and multiplied by 25/k, where k was the number of items in the desired subscale or total scale.
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The questionnaire contained scaled items and open-ended feedback to supplement the items.
Reliability of the instrument was assessed by determining the statistical coherence of the scaled items.
Each scaled item gives 3 descriptions.
Scale items were created by referring to past studies.
The differences between the scale items are in fact by design.
Person misfit generally occurred because the scale items did not adequately capture some individuals' behaviors.
The scale items had satisfactory internal consistency and were factor analyzed using the Varimax procedure.
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