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Table 3

Crude and adjusted ORsa (95% CI) of epithelial ovarian cancer for tea drinkingb

No. of casesNo. of controlsCrude OR95% CIAdjusted OR95% 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 trendc    36.10d  35.71d 
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 trendc    30.73d  30.06d 
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 trendc    32.79d  31.78d 
Black or Oolong tea       
 Never or seldom 113 166 1.0  1.0  
 At most once a week 12 0.61 0.21–1.79 0.98 0.32–3.01 
 2–6 times a week 13 0.11 0.02–0.88 0.13 0.02–1.04 
 At least once a day 14 0.11 0.01–0.81 0.06 0.01–0.50 
 χ2 for trendc    36.43d  39.68d 
Green and black tea       
 Never or seldom 113 166 1.0  1.0  
 At most once a week 16 0.37 0.12–1.13 0.26 0.07–0.96 
 2–6 times a week 0.63 0.16–2.49 0.44 0.08–2.39 
 At least once a day 21 0.21 0.06–0.72 0.25 0.07–0.87 
 χ2 for trendc    33.78d  32.07d 
No. of casesNo. of controlsCrude OR95% CIAdjusted OR95% 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 trendc    36.10d  35.71d 
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 trendc    30.73d  30.06d 
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 trendc    32.79d  31.78d 
Black or Oolong tea       
 Never or seldom 113 166 1.0  1.0  
 At most once a week 12 0.61 0.21–1.79 0.98 0.32–3.01 
 2–6 times a week 13 0.11 0.02–0.88 0.13 0.02–1.04 
 At least once a day 14 0.11 0.01–0.81 0.06 0.01–0.50 
 χ2 for trendc    36.43d  39.68d 
Green and black tea       
 Never or seldom 113 166 1.0  1.0  
 At most once a week 16 0.37 0.12–1.13 0.26 0.07–0.96 
 2–6 times a week 0.63 0.16–2.49 0.44 0.08–2.39 
 At least once a day 21 0.21 0.06–0.72 0.25 0.07–0.87 
 χ2 for trendc    33.78d  32.07d 
a

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).

b

Never or seldom, or zero is the reference category.

c

Ordinal quantity of tea drinking was tested for linear trend.

d

P < 0.001.

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