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. 2024 May 4;63(5):1555–1564. doi: 10.1007/s00394-024-03351-9

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© The Author(s) 2024

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Fig. 2 — Distribution of log plasma levels of caffeine and its two metabolites according to the number of caffeinated beverage cups consumed daily in CoLaus|PsyCoLaus (N = 4423). Comparison were conducted using Dunn’s test. ****: p-value ≤ 10^− 4;*: p-value ≤ 0.05