Variables | Cases n (%) | Controls n (%) | Total n (%) | P value |
Total | 495 (100) | 478 (100) | 973 (100) | |
BMI (kg/m2) | <0.001 | |||
≤18.4 | 24 (4.85) | 37 (7.74) | 61 (6.27) | |
18.5–23.9 | 185 (37.37) | 290 (60.67) | 475 (48.82) | |
24–27.9 | 202 (40.81) | 128 (26.78) | 330 (33.92) | |
≥28.0 | 84 (16.97) | 23 (4.81) | 107 (10.10) | |
Education | <0.001 | |||
<Middle school | 179 (36.16) | 48 (10.04) | 227 (23.33) | |
High school | 181 (36.57) | 82 (17.15) | 263 (27.03) | |
>University | 135 (27.27) | 348 (72.80) | 483 (49.64) | |
Marital status | <0.001 | |||
Single | 10 (2.02) | 66 (13.81) | 76 (7.81) | |
Married | 435 (87.88) | 387 (80.96) | 822 (84.48) | |
Divorced | 50 (10.10) | 25 (5.23) | 75 (7.71) | |
Smoking | 0.311 | |||
Yes | 13 (2.63) | 8 (1.67) | 21 (2.16) | |
No | 482 (97.37) | 470 (98.33) | 952 (97.84) | |
Alcohol consumption | 0.438 | |||
Yes | 13 (2.63) | 9 (1.88) | 22 (2.26) | |
No | 482 (97.37) | 469 (98.12) | 951 (97.74) | |
Nighttime eating | 0.012 | |||
Yes | 48 (9.70) | 72 (15.06) | 120 (12.33) | |
No | 447 (90.30) | 406 (84.94) | 853 (87.67) | |
Sleeping time per day (hours) | <0.001 | |||
<22:00 | 189 (38.18) | 104 (21.76) | 293 (30.11) | |
22:00–24:00 | 292 (58.99) | 353 (73.85) | 645 (66.29) | |
0:00–4:00 | 14 (2.83) | 21 (4.39) | 35 (3.60) | |
Oestrogen receptor status | ||||
Negative | 381 (76.97) | |||
Positive | 114 (23.03) | |||
Progesterone receptor status | ||||
Negative | 358 (72.32) | |||
Positive | 137 (27.68) | |||
Breast cancer type | ||||
Non-invasive | 71 (14.34) | |||
Invasive | 424 (85.66) | |||
Metastasis | ||||
Yes | 121 (24.44) | |||
No | 374 (75.56) |