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Table 1 Validity measures

From: A cross-sectional evidence-based review of pharmaceutical promotional marketing brochures and their underlying studies: Is what they tell us important and true?

Major criteria
1. Was the assignment of patients to treatments randomized?
2. Were all patients who entered the trial accounted for at its conclusion?
3. Were the patients analyzed in the groups to which they were randomized?
Minor criteria
1. Were patients and clinicians kept "blind" to which treatment was being received?
2. Aside from the experimental treatment, were the groups treated equally?
3. Were the groups similar at the start of the trial?