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In both forms of the modified Fresno test [ 20, 21], the specific statistical items of the original Fresno test have been altered or removed.
Reporting guidelines recommend--and many journals now require--that the principal analyses of a study are presented with the three key statistical items: point estimate, confidence interval, and p-value [ 15, 16].
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Statistical item analysis showed very good psychometric properties for the Spanish version of AIDA in Mexico.
A statistical item analysis was previously carried out on the pool of 59 unique items using both classical test theory and item response theory [ 1].
Only 4 items from the pool of 59 items with more than one problem were not removed by the statistical item analysis.
Problems were identified in 3.1% of responses in the 35-item measures, This 'think aloud' analysis supported the previously carried out statistical item analysis and illustrated how 'think aloud' methods can compliment traditional statistical methods for item reduction and the use of both methods may advance measurement development.
A statistical item analysis, combining classical test theory and item response theory, on this pool of 59 items has been reported elsewhere [ 1] and resulted in a subset of 35-items that formed the the Ab-IAP (9 Impairment, 17 Activity limitation and 9 Participation restriction items)[ 1].
While the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed insofar as they were applicable for methodological studies the studies identified in this review did not allow a statistical summary or to perform a meta-analysis due to the variety of subjects, sites, diagnostic criteria and the varied statistical item response theory methods applied.
Statistical item analysis and selection, based on an initial item pool established deductively by expert consensus and tested in a mixed school and clinical sample to gain optimal data variance, led to a psychometrically sound final version of AIDA, with very good scale reliabilities, balanced content consistent with the hypothesized model, and a minimum number of items.
6 The protocol should prespecify the main ("primary") analysis of the primary outcome (Item 12), including the analysis methods to be used for statistical comparisons (Items 20a and 20b); precisely which trial participants will be included (Item 20c); and how missing data will be handled (Item 20c).
Both included studies stated clear objectives (item 1) and assessed outcomes according to the aim of the study (item 4) with appropriate statistical analysis (item 12).
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