Table 1.

Selected characteristics of population-based controls according to categories of tea and coffee consumption, King County, Washington, 2002-2005

	Categories of consumption (cups/unit of time)
Tea	≤1/week	2-6/week	1/day	≥2/day
Controls, No.	594	109	69	91
Mean age, y (SD)	61.2 (8.4)	59.3 (7.1)	63.8 (6.9)	63.5 (7.3)
Caucasian, %	90.7	85.3	92.8	92.3
First-degree family history of prostate cancer, %	12.3	11.9	7.2	9.9
College or graduate degree, %	56.4	62.4	65.2	65.9
Mean BMI, kg/m2 (SD)	27.9 (4.6)	27.5 (4.1)	26.5 (4.8)	27.1 (4.8)
Never smoker, %	44.8	40.4	56.5	57.1
Aspirin use*, %	51.3	53.2	53.6	53.8
Non-aspirin NSAID use*, %	20.9	23.9	13.0	16.5
Diabetes mellitus, %	10.4	11.9	10.1	9.9
History of PSA testing†, %	58.2	52.3	60.9	71.4
≥2 cups of coffee per day, %	46.5	35.5	32.4	24.2
Coffee	≤1/week	2-6/week	1/day	2-3/day	≥4/day
Controls, No.	257	100	146	253	104
Mean age, y (SD)	60.3 (8.5)	60.9 (7.8)	62.1 (8.5)	62.0 (7.8)	61.4 (7.2)
Caucasian, %	86.8	81.0	90.4	95.3	96.2
First-degree family history of prostate cancer, %	11.7	10.0	11.0	13.0	10.6
College or graduate degree, %	60.3	56.0	61.0	62.5	46.2
Mean BMI, kg/m2 (SD)	27.6 (5.2)	28.2 (4.6)	27.2 (4.1)	27.6 (4.1)	27.8 (4.5)
Never smoker, %	62.3	56.0	50.0	36.4	17.3
Aspirin use*, %	47.9	51.0	52.1	53.0	60.6
Non-aspirin NSAID use*, %	21.0	17.0	17.8	21.3	21.4
Diabetes mellitus, %	9.7	10.0	9.6	12.6	9.6
History of PSA testing†, %	55.3	51.0	67.1	61.7	57.7
≥1 cup of tea per day, %	28.9	8.1	22.6	15.8	3.8

Abbreviations: SD, standard deviation; NSAID, non-steroidal anti-inflammatory drug; PSA, prostate-specific antigen.

^*Use at least once a week for 3 months or longer.

^†PSA testing within the 5-year period before reference date.