Table 3.

Analysis of studies on caffeine intake perception, according to the PICOS ¹ method.

Study	Participants	Interventions	Comparisons	Outcomes	S. Design
Bucher and Siegrist (2015) [23]	100 children with one parent (n = 100 couples); ages 7–10	Beverage-sorting task	Product classification in healthy and unhealthy	Negative perception of caffeine	Cross- sectional
Wierzejska et al. (2016) [24]	329 children: ages 11–13	Food frequency questionnaire	Personal interviews	Negative perception of caffeine	Face-to-face interview
Visram et al. (2017) [25]	37 children, 2 groups: ages 10–11 (n = 20) and ages 13–14 (n = 17)	Semi-structured focus groups	Personal opinions	Negative perception of caffeine	Qualitative, based on data

¹ PICOS = P: participants; I: interventions; C: comparisons; O: outcomes; S: study design.