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Methods: A literature search was undertaken in Pub Med, the Excerpta Medica Database (EMBASE), and the Latin American and Caribbean Health Sciences Literature database (Literatura Latino-Americana e do Caribe em Ciências da Saúde [LILACS]).References from included articles were hand-searched. The included papers were all that were published in English, French, Portuguese, and Spanish from the beginning of the database’s indexing until July 8, 2013, where a validation of a questionnaire (at least one demonstration of the validity and at least one of reliability) was performed to measure adherence to antihypertensive pharmacological treatments.Researchers employing face validation on their questionnaire need only look at the questionnaire as a whole and its individual items and ask themselves, "Does this measure what it should?

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Researchers can confirm predictive validation through assessing past or present students with the questionnaire and looking for correlations between performance and questionnaire responses.

Researchers tend to use concurrent validation for a questionnaire when there are other questionnaires or similar measures that investigate the same aspect of interest as the questionnaire in development.

If the creators find that questionnaire's responses correlate with another measurement, then they can confirm concurrent validity.

One example of a use of concurrent validation of a questionnaire for potential students is to see whether the responses on a questionnaire for a group of students are relate to those students' previous test scores.

Content validation refers to observing all the specific items on the questionnaire to determine whether the questionnaire addresses the topic overall.

This type of validation is often the most important validation in developing new questionnaires.Nevertheless, it is unknown whether questionnaires fulfil the minimum requirements of validity and reliability.The aim of this study was to compile validated questionnaires measuring adherence to pharmacological antihypertensive treatments that had at least one measure of validity and one measure of reliability.Reliabilityprocesses indicated that the SQ is reliable: Cronbach’s alpha 0.94 for the global SQ and between 0.80-0.91 for the foursubscales.Test-retest statistic examination revealed stability of the responses at two time points 10 weeks apart.Questionnaire validation is a process in which the creators review the questionnaire to determine whether the questionnaire measures what it was designed to measure.