What does the validity of the questionnaire indicate?

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It measures precisely the aspect of health it is designed to assess.

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It determines the repeatability (stability) of the results when the questionnaire is completed  multiple  times.

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It collects data that can be interpreted in multiple ways.

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It defines the nature of the questions, such as their length and simplicity.

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It ensures that all respondents complete the questionnaire in the same way.

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