Table 1 Baseline characteristics of participants in the TZL cohort (N = 390)
Characteristic | Cases, N (%) | Controls, N (%) | P | |
|---|---|---|---|---|
Age at blood draw (years), mean (SD) | 53.99 (9.58) | 53.99 (9.58) | – | |
Time to cancer diagnosis (years), Median (IQR) | 5.47 (4.89) | – | – | |
Income (CNY/year) | ||||
<10,000 | 13 (6.67%) | 44 (22.56%) | Ref | |
10,000–20,000 | 16 (8.20%) | 22 (11.28%) | 0.110 | |
20,000–35,000 | 36 (18.46%) | 35 (17.95%) | 0.004 | |
≥35,000 | 130 (66.67%) | 94 (48.21%) | <0.001 | |
Alcohol consumption | ||||
Never | 183 (93.85%) | 184 (94.36%) | Ref | |
Former | 2 (1.02%) | 2 (1.02%) | 0.971 | |
Current | 10 (5.13%) | 9 (4.62%) | 0.751 | |
Smoking | ||||
Never | 194 (99.49%) | 193 (98.98%) | Ref | |
Former | 0 (0.00%) | 1 (0.51%) | 0.990 | |
Current | 1 (0.51%) | 1 (0.51%) | >0.999 | |
BMI (kg/m2), mean (SD) | 25.18 (3.88) | 24.56 (3.49) | 0.090 | |
BMI (kg/m2) | ||||
<24 | 78 (40.00%) | 89 (45.64%) | Ref | |
≥24 | 117 (60.00%) | 106 (54.36%) | 0.264 | |
Waist (cm) | ||||
<85 | 113 (57.95%) | 127 (65.13%) | Ref | |
≥85 | 82 (42.05%) | 68 (34.87%) | 0.159 | |
Height, mean (SD) | 156.88 (5.48) | 155.29 (5.68) | 0.009 | |
Age at menarche (years), mean (SD) | 16.00 (2.20) | 16.94 (2.48) | <0.001 | |
Age at menarche (years) | ||||
<14 | 25 (12.82%) | 18 (9.23%) | Ref | |
≥14 | 170 (87.18%) | 177 (90.77%) | 0.477 | |
Menopausal status | ||||
Premenopausal | 63 (32.31%) | 70 (35.90%) | Ref | |
Postmenopausal | 132 (67.69%) | 125 (64.10%) | 0.244 | |
Number of births | ||||
1 | 99 (50.77%) | 84 (43.08%) | Ref | |
≥ 2 | 96 (49.23%) | 111 (56.92%) | 0.155 | |
Family history of breast cancer | ||||
No | 194 (99.49%) | 193 (98.97%) | Ref | |
Yes | 1 (0.51%) | 2 (1.03%) | 0.742 | |
