American Association for Cancer Research

Table 3

Crude and adjusted ORs^a (95% CI) of epithelial ovarian cancer for tea drinking^b

	No. of cases	No. of controls	Crude OR	95% CI	Adjusted OR	95% CI
Years of tea drinking
0	113	166	1.0		1.0
<15	77	222	0.51	0.36–0.73	0.47	0.32–0.70
15–30	42	144	0.43	0.28–0.65	0.43	0.28–0.68
>30	22	120	0.27	0.16–0.45	0.23	0.13–0.41
χ² for trend^c				36.10^d		35.71^d
Overall tea consumption
Never or seldom	113	166	1.0		1.0
At most once a week	34	103	0.49	0.31–0.77	0.44	0.27–0.72
2–6 times a week	27	105	0.38	0.23–0.61	0.37	0.22–0.63
At least once a day	80	278	0.42	0.30–0.60	0.39	0.27–0.57
χ² for trend^c				30.73^d		30.06^d
Green tea only
Never or seldom	113	166	1.0		1.0
At most once a week	25	75	0.49	0.29–0.82	0.42	0.24–0.73
2–6 times a week	23	85	0.40	0.24–0.67	0.40	0.23–0.70
At least once a day	76	243	0.46	0.32–0.65	0.43	0.30–0.63
χ² for trend^c				32.79^d		31.78^d
Black or Oolong tea
Never or seldom	113	166	1.0		1.0
At most once a week	5	12	0.61	0.21–1.79	0.98	0.32–3.01
2–6 times a week	1	13	0.11	0.02–0.88	0.13	0.02–1.04
At least once a day	1	14	0.11	0.01–0.81	0.06	0.01–0.50
χ² for trend^c				36.43^d		39.68^d
Green and black tea
Never or seldom	113	166	1.0		1.0
At most once a week	4	16	0.37	0.12–1.13	0.26	0.07–0.96
2–6 times a week	3	7	0.63	0.16–2.49	0.44	0.08–2.39
At least once a day	3	21	0.21	0.06–0.72	0.25	0.07–0.87
χ² for trend^c				33.78^d		32.07^d

	No. of cases	No. of controls	Crude OR	95% CI	Adjusted OR	95% CI
Years of tea drinking
0	113	166	1.0		1.0
<15	77	222	0.51	0.36–0.73	0.47	0.32–0.70
15–30	42	144	0.43	0.28–0.65	0.43	0.28–0.68
>30	22	120	0.27	0.16–0.45	0.23	0.13–0.41
χ² for trend^c				36.10^d		35.71^d
Overall tea consumption
Never or seldom	113	166	1.0		1.0
At most once a week	34	103	0.49	0.31–0.77	0.44	0.27–0.72
2–6 times a week	27	105	0.38	0.23–0.61	0.37	0.22–0.63
At least once a day	80	278	0.42	0.30–0.60	0.39	0.27–0.57
χ² for trend^c				30.73^d		30.06^d
Green tea only
Never or seldom	113	166	1.0		1.0
At most once a week	25	75	0.49	0.29–0.82	0.42	0.24–0.73
2–6 times a week	23	85	0.40	0.24–0.67	0.40	0.23–0.70
At least once a day	76	243	0.46	0.32–0.65	0.43	0.30–0.63
χ² for trend^c				32.79^d		31.78^d
Black or Oolong tea
Never or seldom	113	166	1.0		1.0
At most once a week	5	12	0.61	0.21–1.79	0.98	0.32–3.01
2–6 times a week	1	13	0.11	0.02–0.88	0.13	0.02–1.04
At least once a day	1	14	0.11	0.01–0.81	0.06	0.01–0.50
χ² for trend^c				36.43^d		39.68^d
Green and black tea
Never or seldom	113	166	1.0		1.0
At most once a week	4	16	0.37	0.12–1.13	0.26	0.07–0.96
2–6 times a week	3	7	0.63	0.16–2.49	0.44	0.08–2.39
At least once a day	3	21	0.21	0.06–0.72	0.25	0.07–0.87
χ² for trend^c				33.78^d		32.07^d

Estimates from multivariate logistic regression models included terms for age at interview (in years; continuous), education (none, primary, secondary, tertiary), living area (urban, rural), BMI (5 years ago; continuous), tobacco smoking (never, ever), alcohol consumption (never, ever), coffee drinking (never, ever), family income (yuan per month; ≤1000, 1001–2000, ≥2001), marital status (never married, married, widowed or divorced or separated), menopause status (no, yes), parity (full-term pregnancy; continuous), tubal ligation (no, yes), oral contraceptive use (no, yes), physical activity (never, ever), and family history of ovarian cancer (no, yes).

Never or seldom, or zero is the reference category.

Ordinal quantity of tea drinking was tested for linear trend.

P < 0.001.

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