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Purpose: To develop and validate a questionnaire to evaluate caffeine consumption habits in adults. Methods: A caffeine habits and consumption questionnaire (CaffCo) was developed in three stages. First, focus groups explored factors influencing consumption of various caffeine-containing products. Second, thematic analysis (reported elsewhere) was used to develop a draft CaffCo. Third, pilot testing of this draft examined comprehensibility, ease of use, and test-retest reliability among students (n = 227). Content validity and construct validity were assessed. Results: The CaffCo questionnaire items explored four main themes: social drivers, environmental opportunity, functional expectations, and individual experiences. Pilot testing reflected influences of caffeinated product consumption. CaffCo demonstrates good content validity and construct validity. The test-retest showed good interrater reliability (Cronbach's alpha >0.70). Conclusion: CaffCo shows good validity and reliability. It can be used, or adapted for use, to identify patterns of caffeine consumption for a range of caffeinated products.
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Rowe et al. (2020) studied this question.
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