Table 1 Adjusted odds ratios and 95% confidence intervals for lifestyle factors in 472 cases and 464 controls (recruitment period: December 2010 to November 2011)
Variables | Case (n = 472) | Control (n = 464) | ORa(95% CIs) | |||
|---|---|---|---|---|---|---|
n (%) | n (%) | |||||
Age (year) (mean ± SD) | 54.72 ± 12.45 | 53.56 ± 11.00 | ||||
Menopausal status | ||||||
Pre | 280 | (59) | 271 | (58) | ||
Post | 192 | (41) | 193 | (42) | ||
Height (cm) | ||||||
≤150 | 95 | (20) | 78 | (17) | 1.16 | (0.78-1.71) |
151-155 | 147 | (32) | 145 | (32) | Ref. | |
156-160 | 152 | (33) | 156 | (34) | 0.99 | (0.72-1.36) |
>160 | 72 | (15) | 81 | (18) | 0.93 | (0.63-1.38) |
Weight (Kg) | ||||||
≤50 | 159 | (34) | 173 | (37) | 0.97 | (0.69-1.36) |
51-55 | 112 | (24) | 118 | (26) | Ref. | |
56 -60 | 92 | (20) | 78 | (17) | 1.24 | (0.83-1.85) |
>60 | 104 | (22) | 93 | (20) | 1.18 | (0.80-1.73) |
BMI (Kg/m2) | ||||||
20 | 102 | (22) | 96 | (21) | 1.39 | (0.96-2.01) |
20-21.9 | 118 | (25) | 150 | (33) | Ref. | |
22-23.9 | 104 | (22) | 102 | (22) | 1.28 | (0.89-1.84) |
≥24 | 139 | (30) | 112 | (24) | 1.54 | (1.08-2.19) |
Smoking status | ||||||
Never | 406 | (87) | 432 | (94) | Ref. | |
Current or former | 60 | (13) | 28 | (6) | 2.49 | (1.56-4.06) |
Alcohol drinking | ||||||
Never | 240 | (51) | 218 | (47) | ref. | |
Current or former | 231 | (49) | 243 | (53) | 0.91 | (0.70-1.18) |
Alcohol intake (g/day) | ||||||
0 | 240 | (51) | 218 | (48) | ref. | |
<5 | 140 | (30) | 130 | (29) | 1.02 | (0.75-1.39) |
5-10 | 53 | (11) | 62 | (14) | 0.82 | (0.54-1.24) |
10> | 36 | (8) | 45 | (10) | 0.75 | (0.46-1.21) |
Meat intake (times/week) | ||||||
≤1 | 101 | (22) | 66 | (14) | Ref. | |
2-4 | 297 | (64) | 307 | (67) | 0.65 | (0.45-0.92) |
≥5 | 67 | (14) | 88 | (19) | 0.51 | (0.32-0.80) |
Soy intake (times/week) | ||||||
≤1 | 45 | (10) | 49 | (11) | Ref. | |
2-4 | 236 | (50) | 227 | (50) | 1.12 | (0.72-1.76) |
≥5 | 188 | (40) | 182 | (40) | 1.09 | (0.69-1.72) |
Fish intake (times/week) | ||||||
≤1 | 103 | (22) | 94 | (20) | Ref. | |
2-4 | 297 | (64) | 314 | (68) | 0.85 | (0.62-1.18) |
≥5 | 67 | (14) | 53 | (11) | 1.09 | (0.68-1.74) |
Eggs intake (times/week) | ||||||
≤1 | 108 | (23) | 95 | (21) | Ref. | |
2-4 | 238 | (51) | 247 | (54) | 0.86 | (0.62-1.20) |
≥5 | 120 | (26) | 112 | (25) | 0.96 | (0.66-1.41) |
Milk intake (times/week) | ||||||
≤1 | 84 | (18) | 82 | (18) | Ref. | |
2-4 | 157 | (34) | 135 | (30) | 1.14 | (0.78-1.67) |
≥5 | 226 | (48) | 238 | (52) | 0.92 | (0.64-1.31) |
Fruit intake (times/week) | ||||||
≤1 | 112 | (24) | 112 | (24) | Ref. | |
2-4 | 172 | (37) | 149 | (32) | 1.11 | (0.79-1.57) |
≥5 | 184 | (39) | 199 | (43) | 0.86 | (0.61-1.21) |
Mushrooms intake (times/week) | ||||||
≤1 | 156 | (34) | 120 | (26) | Ref. | |
2-4 | 247 | (53) | 261 | (57) | 0.73 | (0.54-0.98) |
≥5 | 61 | (13) | 77 | (17) | 0.60 | (0.40-0.91) |
Green and yellow vegetables intake (times/week) | ||||||
≤1 | 47 | (10) | 28 | (6) | Ref. | |
2-4 | 231 | (50) | 204 | (46) | 0.66 | (0.39-1.09) |
≥5 | 183 | (40) | 212 | (48) | 0.48 | (0.29-0.80) |
Coffee intake (times/week) | ||||||
<1 | 132 | (28) | 103 | (22) | Ref. | |
1 | 154 | (33) | 158 | (34) | 0.77 | (0.55-1.09) |
2-3 | 135 | (29 | 160 | (35) | 0.68 | (0.48-0.96) |
≥4 | 45 | (10) | 40 | (9) | 0.91 | (0.55-1.51) |
Green tea intake (times/week) | ||||||
<1 | 200 | (43) | 182 | (40) | Ref. | |
1 | 151 | (33) | 133 | (29) | 0.97 | (0.71-1.33) |
2-3 | 63 | (14) | 87 | (19) | 0.63 | (0.43-0.93) |
≥4 | 48 | (10) | 55 | (12) | 0.72 | (0.46-1.12) |
Leisure-time exercise | ||||||
None | 254 | (54) | 214 | (46) | Ref. | |
Current | 214 | (46) | 248 | (54) | 0.70 | (0.54-0.91) |
Intensity of physical activityb (METs/week) | ||||||
0 | 254 | (56) | 214 | (47) | Ref. | |
>6.0 | 51 | (11) | 42 | (9) | 1.05 | (0.67-1.65) |
6.0-11.9 | 44 | (10) | 60 | (13) | 0.61 | (0.39-0.93) |
12.0-23.9 | 48 | (11) | 80 | (17) | 0.51 | (0.34-0.75) |
≥24.0 | 52 | (12) | 61 | (13) | 0.70 | (0.46-1.07) |
Age at menarche (year) | ||||||
≤12 | 140 | (30) | 201 | (44) | 0.88 | (0.616-1.25) |
13 | 109 | (23) | 113 | (25) | Ref. | |
≤14 | 217 | (47) | 144 | (31) | 1.25 | (0.882-1.78) |
Parity | ||||||
0 | 86 | (20) | 75 | (17) | Ref. | |
1-2 | 247 | (57) | 265 | (59) | 0.74 | (0.511‒1.06) |
≥3 | 102 | (23) | 107 | (24) | 0.76 | (0.495‒1.15) |
Age at first childbirth (year) | ||||||
<25 | 151 | (40) | 142 | (37) | 1.22 | (0.89-1.68) |
25-29 | 162 | (43) | 187 | (49) | Ref. | |
≥30 | 63 | (17) | 50 | (13) | 1.46 | (0.96-2.25) |
Breastfeeding | ||||||
No | 125 | (27) | 104 | (23) | Ref. | |
Yes | 339 | (73) | 355 | (77) | 0.77 | (0.57-1.04) |
History of benign breast disease | ||||||
No | 351 | (79) | 354 | (79) | Ref. | |
Yes | 93 | (21) | 92 | (21) | 1.03 | (0.74-1.42) |
Family history of breast cancer | ||||||
No | 391 | (88) | 373 | (88) | Ref. | |
Yes | 53 | (12) | 52 | (12) | 0.98 | (0.65-1.47) |
History of HRT use | ||||||
No | 424 | (92) | 412 | (90) | Ref. | |
Yes | 35 | (8) | 45 | (10) | 0.76 | (0.47-1.21) |
Education | ||||||
High school or less | 259 | (55) | 196 | (43) | Ref. | |
Two-year college | 144 | (31) | 144 | (31) | 0.78 | (0.57-1.05) |
University | 64 | (14) | 120 | (26) | 0.41 | (0.29-0.59) |