The requirements for each study differ, as do the number and type of screening questions. Sometimes they are simple and you only need to meet one or two of the criteria to qualify, but more often strict and very specific criteria dictate who is eligible to participate. We strive to keep the number of questions to an absolute minimum and only include those that are absolutely necessary to confirm eligibility purposes. Screening questions should not typically exceed 15 questions or take longer than 5 minutes on average time to answer, although occasionally there are exceptions. We aim to end the screening process as soon as a respondent is definitively screened out.
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