AUTHOR=Mendes Guilherme Falcão , Reis Caio Eduardo Gonçalves , Nakano Eduardo Yoshio , Zandonadi Renata Puppin 

TITLE=Brief Version of Caffeine Expectancy Questionnaire in Brazil

JOURNAL=Frontiers in Nutrition

VOLUME=Volume 8 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2021.695385

DOI=10.3389/fnut.2021.695385

ISSN=2296-861X

ABSTRACT=Extensive questionnaires’ application has the limitation of filling time bias, related to the ability to focus and accurately respond to many items, justifying the necessity for a brief version. This study aimed to build a brief version of the Caffeine Expectancy Questionnaire – Brazil (B-CaffEQ-BR) composed of 21 items divided into 7 factors, with adequate consistency and reproducibility as the full version. Quantitative procedures using statistical modeling were applied using the CaffEQ-BR (full version) database keeping the Mean Absolute Error (based on the full version) less than 0.5 and Cronbach's alpha and Intraclass Correlation Coefficient – ICC ≥ 0.7. The expert panel (n = 3), in a blind design, evaluated the semantic structuring within the options indicated by previous statistical modeling until the expert panel's agreement. The participants (n = 62), Brazilian adults regular caffeine consumers (175.8 ± 94.4 mg/day), 62.9% women, 33.1 ± 9.7 y, 24.5 ± 3.8 kg/m², 62.9% self-identified as white, were asked to respond twice the online questionnaire in an interval of 48 – 72 hours. The first sample (n = 40) tested interobserver reproducibility with the twice application of B-CaffEQ-BR. Another sample (n = 22) answered the CaffEQ-BR (full version) and B-CaffEQ-BR, and the last sample (n = 18) performed the reverse process. The B-CaffEQ-BR presented excellent internal consistency (Cronbach’s alpha ≥ 0.729) and overall reproducibility (ICC ≥ 0.915) for the entire questionnaire and its seven factors. The B-CaffEQ-BR can be a valuable tool in caffeine research with the Brazilian adult population.