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As an initial step the questionnaire was subjected to an item analysis and a final test form was compiled.
These two items, however, remained in the final test form since their content was highly representative of the construct.
To subject the items of the developed instrument to an item analysis to assess them according to classical test theory criteria and to compile a final test form.
The item analysis led to the decision that items 4 and 22 (see Additional file 1) would not be included in the final test form.
To check the final test form for validity and reliability and to check whether the questionnaire is able to distinguish between episodically and chronically depressed patients.
In a second step, after the selection of the items and collation of the final test form, the reliability (internal consistency, split-half reliability) and validity (construct validity, discriminative validity) were checked.
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Each of the final test forms of the TRC-e included 33 items, eight of which were anchor items.
The number of items retained in each final version of the TRC-n forms is presented in Table 1 ("Selected items for the final test forms" column).
The number of items retained in each final version of the TRC-e forms is presented in Table 1 (column "Selected items for the final test forms").
Final test forms of the TRC-n were each composed of 27 items, six of which were anchor items between adjacent forms.
Results of the PCA of the residuals of the TRC-e final test forms revealed that all the secondary dimensions had eigenvalues less than 2.0.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com