Table 2

Soy food and other dietary intake during adolescence and risk of breast cancer, The Shanghai Breast Cancer Study, 1996–1998

Median intake among controlsaAdjusted ORs (95% CI) by quintileb,c,dTrend test P
Q1 (low)Q2Q3Q4Q5
Soy foods (total)5.41.000.75 (0.60–0.93)0.69 (0.55–0.87)0.69 (0.55–0.86)0.51 (0.40–0.65)<0.01
 Bean curd (tofu)0.91.000.83 (0.68–1.02)0.88 (0.68–1.13)0.67 (0.54–0.84)0.70 (0.55–0.90)<0.01
 Soy milk01.000.75 (0.64–0.88)<0.01
 Soy products other than tofu3.51.000.85 (0.67–1.08)0.79 (0.59–1.06)0.65 (0.50–0.85)<0.01
Fresh legumese35.61.000.95 (0.74–1.22)0.98 (0.80–1.19)0.83 (0.65–1.05)0.93 (0.74–1.16)0.27
Dried beansf0.71.000.84 (0.69–1.01)0.78 (0.64–0.96)0.75 (0.59–0.95)<0.01
Vegetables/fruits (total)g171.01.000.88 (0.70–1.12)0.85 (0.67–1.08)1.01 (0.81–1.27)0.95 (0.74–1.21)0.97
 Vegetablesg150.01.000.87 (0.72–1.06)0.90 (0.68–1.19)1.17 (0.96–1.43)0.72 (0.50–1.03)0.56
 Fruitsg4.91.000.90 (0.74–1.10)0.97 (0.78–1.22)0.99 (0.79–1.23)0.96
Rice/wheat productsg400.01.000.95 (0.71–1.29)0.96 (0.78–1.18)0.86 (0.71–1.04)0.65 (0.46–0.93)0.03
Meats (total)g14.21.000.94 (0.74–1.19)1.11 (0.87–1.41)1.00 (0.78–1.27)1.00 (0.78–1.29)0.83
 Porkg8.21.001.08 (0.84–1.38)1.15 (0.93–1.41)1.00 (0.78–1.29)1.11 (0.88–1.41)0.46
 Other meatsg1.41.000.92 (0.75–1.12)0.96 (0.76–1.21)0.91 (0.74–1.13)0.51
Eggsg9.91.001.00 (0.80–1.25)1.01 (0.81–1.26)0.98 (0.78–1.24)0.86 (0.67–1.11)0.34
Seafoodsg14.21.000.86 (0.68–1.08)0.86 (0.67–1.10)0.89 (0.71–1.12)0.89 (0.67–1.17)0.47
Milkg01.000.76 (0.59–0.98)0.03
Preserved foods (total)g19.21.001.08 (0.86–1.36)1.05(0.83–1.32)0.89(0.70–1.13)0.94 (0.73–1.20)0.27
 Preserved meat/fishg0.71.001.01 (0.83–1.24)1.24 (1.01–1.53)1.12 (0.90–1.38)0.10
 Salted eggsg1.41.000.77 (0.63–0.95)1.00 (0.80–1.23)1.00 (0.80–1.24)0.62
 Preserved vegetablesg14.21.001.17 (0.93–1.47)1.08 (0.87–1.35)0.89 (0.70–1.12)0.97 (0.73–1.28)0.24
  • a Average daily intake in grams. Soy food intake was converted to soy protein equivalence (tofu, 6.2%; soy milk, 1.8%; and soy products other than tofu, 24.72%); Refs. 33 34 35 .

  • b ORs were compared to the lowest quintile of intake and adjusted for intake level of rice and wheat products, age, education, family history of breast cancer, history of breast fibroadenoma, WHR, age at menarche, physical activity, ever had live birth, age at first live birth, menopausal status, and age at menopause. Quintile cutoffs are 0.44, 0.88, 1.32, and 2.2 gram(s)/day for tofu and 2.20, 4.41, 6.61, and 11.01 gram(s)/day for total soyfoods.

  • c Ever versus never for analyses of foods rarely consumed.

  • d Tertile distribution of intake for analyses of foods when a large number of subjects did not eat the foods. Tertile cutoffs are 3.52 and 5.28 grams/day for soy products other than tofu.

  • e Commonly consumed fresh legumes include peas, string beans, and kidney beans, and, less commonly consumed legumes include soy beans.

  • f Commonly consumed dry beans are soy bean seeds, mung beans, and red beans.

  • g Additionally adjusted for total soy food intake.