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The PEO question format is useful for qualitative research questions. Questions based on this format identify three concepts: (1) P opulation, (2) E xposure, and (3) O utcome(s) . Example: In infants, is there an association between exposure to soy milk and the subsequent development of peanut allergy ( Levine, Ioannidis, Haines, & Guyatt, 2014 )?.