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It should be noted, however, that the low dropout rate (10%) indicates the questionnaire was clear and manageable for most respondents, and potential skewing due to respondent fatigue was minimized by the methods employed.
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Pre- and post-field work assessments indicate the questionnaire has good face validity and content validity.
Pre- and post-fieldwork assessments indicate the questionnaire has good face validity and content validity.
All patients in our study completed the questionnaire without any difficulties, which indicated the questionnaire had good cultural acceptability.
No DIF in the 18-item questionnaire was found between types of hospitals, indicating the questionnaire measured the same construct across hospitals.
Findings provide empirical support to the transcultural validity of the EDI, which indicated the questionnaire had good reliability and validity among adolescent girls in Hong Kong.
The grade level estimates range from grade 5 through college; grade 7 is fairly low; indicating the Questionnaire was quite suitable for use by lay people.
A PSI value of 0.8 indicated the questionnaire can distinguish subjects in up to three levels of the dominant construct, which is the minimum acceptable level for a measurement scale [ 30].
The multidimensionality of the questionnaire indicates the need for a summary of several components into subscales.
Reliability above 0.8 is considered acceptable, whereas above 0.7 indicates that the questionnaire is valuable but should be revised, and below 0.7 indicates low reliability.
As noted above, it took respondents an average of about 1 minute to answer the questions, which indicates that the questionnaire was easy to understand.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com