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Time course of plasma concentrations of alcohol and caffeine. Data points and error bars represent mean and SD values for 16 participants. Amount of alcohol of 10 μmol/mL corresponds to 46.07 mg/dL and 20 μmol/mL to 92.1 mg/dL. Conditions: alcohol (60 g); alcohol (60 g) + RB (240 mg caffeine), RB (240 mg caffeine), placebo. *P < .05 and **P < .01 indicate significant differences among both conditions.
