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. Author manuscript; available in PMC: 2013 Feb 20.
Published in final edited form as: J Alzheimers Dis. 2011;27(3):553–566. doi: 10.3233/JAD-2011-110431

Consumption of Tea, Coffee, decaffeinated Coffee, and estimated total Caffeine intake at baseline

Characteristic Tea consumption at baseline, cups Caffeinated Coffee consumption at baseline, cups
Never
N = 1.131
5–10/yr
N = 533
1–3/mo
N = 890
1–4/wk
N = 1.070
≥5/wk
N = 1.185
Never
N = 1.656
5–10/yr
N = 308
1–3/mo
N = 330
1–4/wk
N = 433
≥5/wk
N = 2.063
Tea, %
 Never 33.6 12.3 12.7 17.8 20.1
 5–10 times/yr 7.3 19.8 13.3 8.8 13.0
 1–3 times/mo 12.7 19.2 28.8 20.1 21.1
 1–4 times/wk 19.3 25.3 26.1 32.1 21.4
 ≥5 times/wk 27.0 23.4 19.1 21.3 24.4
Coffee, caffeinated, %
 Never 49.4 22.7 23.8 30.1 38.0
 5–10 times/yr 3.4 11.4 6.7 7.3 6.1
 1–3 times/mo 3.7 8.3 10.7 8.1 5.4
 1–4 times/wk 6.8 7.1 9.8 13.1 7.8
 ≥5 times/wk 36.7 50.5 49.0 41.5 42.8
Coffee, decaffeinated, %
 Never 44.2 36.9 36.5 31.5 39.9 31.4 11.7 7.3 22.9 55.4
 5–10 times/yr 4.3 11.2 7.6 7.0 6.0 3.2 5.9 4.0 5.8 10.1
 1–3 times/mo 5.6 7.2 12.4 7.7 8.2 4.9 7.8 15.2 6.5 10.0
 1–4 times/wk 8.9 9.6 12.4 15.1 8.7 10.5 13.4 14.6 22.7 8.0
 ≥5 times/wk 37.1 35.2 31.1 38.8 37.1 50.0 61.2 59.0 42.1 16.5
Total caffeine from coffee
& tea, median, mg/wk
12 429 226 288 363 14 26 53 288 439
Total caffeine from coffee
& tea, mean, mg/wk
172 238 248 283 351 57 69 92 272 481