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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