Relation of 24-hour urinary caffeine and caffeine metabolite excretions with self-reported consumption of coffee and other caffeinated beverages in the general population.

Nutr Metab (Lond) · 2016 · PMC5112879 · PMID 27891166

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a positive trendno p-value reported

We may assume that a positive trend might also be observed for an increasing consumption frequency of decaffeinated coffee as this beverage also contains a certain amount of caffeine [ 37 ], yet due to the total lack of participants for several consumption frequencies of exclusive decaffeinated coffee intake, this couldn’t be assessed here.

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