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Table 3 Optimal sensitivity, specificity and cutoff points for weekly caffeinated coffee consumption based on 24-h urinary metabolites – ROC analysis (Fig. 1)

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

  Sensitivity Specificity Cutoff (mg)
24-h urinary metabolite
 24-h urinary caffeine 0.723 0.840 1.391
 24-h urinary paraxanthine 0.801 0.790 2.582
 24-h urinary theophylline 0.787 0.800 0.774
 24-h urinary theobromine 0.938 0.160 1.665