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Exact(28)
Items are measured on a 7-point scale, making the maximum CSSA score 112.
A total of 26 anthropometric data items are measured using the surface and skeletal models.
Items are measured on a five point Likert scale from 'never' to 'always'always
All items are measured on a 5-point response format ranging from "1: strongly disagree" to "5: strongly agree".
All items are measured on a frequency scale ranging from 0 (never) to 5 (always).
All eight items are measured using ordinal 11-point box scales.
Similar(32)
These values indicate that items are measuring the same concept.
Alternatively, high correlations between items could suggest that the items are measuring a single latent trait.
An assumption of IRT is that the items are measuring a unidimensional underlying construct.
The spread of the item means indicates that items are measuring different degrees of knee-related quality of life.
High correlations could imply a low discriminant validity and suggest that two items are measuring similar concepts [ 37].
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