Table 1.
Distribution of selected characteristics of 1 156 cases and 1 013 controls among Hong Kong women.
| Characteristic | Controls (N = 1 013) | Cases (N = 1 156) | p-value |
|---|---|---|---|
| Age, Mean ± SD | 54.25 ± 11.7 | 56.53 ± 11.8 | <0.01 |
| Educational attainment, n (%) | |||
| Primary or below | 364 (35.9) | 429 (37.1) | |
| Secondary | 529 (52.2) | 579 (50.1) | |
| Tertiary | 77 (7.6) | 78 (6.7) | |
| Unknown | 43 (4.2) | 70 (6.1) | 0.59 |
| Family breast cancer history, n (%) | |||
| No | 972 (96.0) | 1031 (89.2) | |
| Yes | 41 (4.0) | 125 (10.8) | <0.01 |
| Previous history of benign breast diseases, n (%) | |||
| No | 913 (90.1) | 1017 (88.0) | |
| Yes | 100 (9.9) | 139 (12.0) | 0.11 |
| Menopausal status | |||
| Pre-menopausal | 341 (33.7) | 388 (33.6) | |
| Post-menopausal | 616 (60.8) | 695 (60.1) | |
| Unknown | 56 (5.5) | 73 (6.3) | 0.93 |
| Body mass index, n (%) | |||
| Normal (18.5–24.9) | 541 (53.4) | 630(54.5) | |
| Underweight (<18.5) | 83 (8.7) | 56 (4.8) | |
| Overweight (≥25.0) | 228 (22.5) | 399 (34.5) | |
| Unknown | 161 (15.9) | 71 (6.1) | <0.01 |
| Shift work, n (%) | |||
| No | 861 (85.0) | 1007 (87.1) | |
| Yes | 152 (15.0) | 149 (12.9) | 0.16 |
| Tobacco smoking, n (%) | |||
| Never | 933 (92.1) | 1077 (93.2) | |
| Former | 34 (3.4) | 37 (3.2) | |
| Current | 46 (4.5) | 42 (3.6) | 0.55 |
| Alcohol consumption, n (%) | |||
| Non users | 969 (95.7) | 1098 (95.0) | |
| Users | 44 (4.3) | 58 (5.0) | 0.46 |
| Tea consumption, n (%) | |||
| Non users | 434 (42.8) | 467 (40.4) | |
| Users | 579 (57.2) | 689 (59.6) | 0.25 |
| Deep Fried food consumption, n (%) | |||
| Less than once per month | 453 (44.7) | 518 (44.8) | |
| Once per month | 381 (37.6) | 429 (37.1) | |
| Once per week | 177 (17.5) | 208 (18.0) | 0.94 |
| Green vegetable consumption, n (%) | |||
| Less than 3 times per week | 110 (10.9) | 128 (11.1) | |
| 4–6 times per week | 90 (8.9) | 128 (11.1) | |
| Everyday | 813 (80.3) | 900 (77.9) | 0.22 |