Table 1.

Method of exposure assessment for beverages and caffeine

		Caffeine conversion formula
Reference	Range of intake	Coffee/cup1	Tea/cup
		mg caffeine
(12)	0, 1–3, 4–6, 7–10, >10 (cups of tea or coffee/d)	85	30
(15)	0, 1, 2, 3, 4, >4 (cups of coffee/d)	85	N/A
(13)	0–1, 2–3, >3 (caffeine units/d)	100	50
(8)	<1 cup/wk, <1, 1–2, 3–5, 6–9, >10 (cups of tea or coffee/d)	N/A	N/A
(14)	<22, 22–62, >62 (mg caffeine/d)	63	47
(3)	0, 0.14, 0.46, 2.5, 5 (cups of tea or coffee/wk)	85	30

¹1 cup ≈ 250 mL.