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Our two validity checklists are helpful but do have limitations, as some items are optional and there is no weighting criteria of individual items.
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The 9 items are based on a combination of the Cochrane approach to assess the risk of bias, combined with the validity checklist of Jadad et al. [ 17, 18].
Apart from the Behrens and Langer checklist questions, three core criteria that were repeatedly found in almost all German checklists and in the validated checklists were also added as comprehensive general questions: openness, inter-subjective validity and reflexivity [ 10- 12].
We converted the two frameworks [ 21, 23] into two validity assessment checklists.
As is the case with reliability, global judgements appear to show better concurrent validity than checklists in surgery [ 19, 38] as well as in Psychiatry [ 39].
The methodological quality of studies was assessed using a validated checklist for retrospective and prospective studies 3 assessing aspects of 1: 'reporting', 2: 'external validity', 3: 'internal validity bias', 4: 'internal validity confounding' and 5: 'power'power
To establish content validity, the checklist was reviewed by two practicing psychiatrists and two psychologists in Khooramabad.
To date, few studies have reported formal validity testing of checklists for use in clinical settings.
First, we will establish the content validity of the checklists with a group of likely users.
Furthermore, the face validity of the checklists was good and at least 88% of the experts with an opinion consider the reporting quality and methodological quality items relevant.
Physicians may have therefore selected 'yes' when one aspect of the checklist item was delivered, suggesting that greater checklist validity could be achieved if each item was unidimensional [35].
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