Baseline Characteristics of the 458 Patients
| . | Median or % . | IQR . | Missing . |
|---|---|---|---|
| Age at diagnosis (y) | 59.6 | 51.0-66.5 | — |
| Height (cm) | 165 | 161-170 | 1 |
| Weight (kg) | 68.0 | 60.5-76.0 | 1 |
| Body mass index (kg/m2) | 24.5 | 22.4-27.6 | 2 |
| Waist-to-hip ratio | 0.83 | 0.78-0.88 | 4 |
| Total breast volume (cm3) | 1,000 | 688-1,575 | 9 |
| Age at menarche (y) | 13 | 12-14 | 4 |
| Premenopausal (%) | 23 | 2 | |
| Age at menopause (y) | 50 | 47-52 | 123 |
| Age at first full-term pregnancy* (y) | 25 | 22-28 | 77 |
| Parity | 2 | 1-3 | 1 |
| Ever oral contraceptive use (%) | 69 | — | |
| Ever hormone replacement therapy use (%) | 45 | — | |
| Abstainer of alcohol (%) | 12 | 2 | |
| Current smoker (%) | 22 | — | |
| Daily coffee consumption (cups) (%) | 1 | ||
| None | 10 | ||
| 1 | 7 | ||
| 2 | 19 | ||
| 3 | 24 | ||
| 4 | 23 | ||
| 5 | 8 | ||
| ≥6 | 10 | ||
| First-degree relative with breast cancer (%) | 19 | 13 | |
| First- or second-degree relative with breast cancer (%) | 33 | 16 |
| . | Median or % . | IQR . | Missing . |
|---|---|---|---|
| Age at diagnosis (y) | 59.6 | 51.0-66.5 | — |
| Height (cm) | 165 | 161-170 | 1 |
| Weight (kg) | 68.0 | 60.5-76.0 | 1 |
| Body mass index (kg/m2) | 24.5 | 22.4-27.6 | 2 |
| Waist-to-hip ratio | 0.83 | 0.78-0.88 | 4 |
| Total breast volume (cm3) | 1,000 | 688-1,575 | 9 |
| Age at menarche (y) | 13 | 12-14 | 4 |
| Premenopausal (%) | 23 | 2 | |
| Age at menopause (y) | 50 | 47-52 | 123 |
| Age at first full-term pregnancy* (y) | 25 | 22-28 | 77 |
| Parity | 2 | 1-3 | 1 |
| Ever oral contraceptive use (%) | 69 | — | |
| Ever hormone replacement therapy use (%) | 45 | — | |
| Abstainer of alcohol (%) | 12 | 2 | |
| Current smoker (%) | 22 | — | |
| Daily coffee consumption (cups) (%) | 1 | ||
| None | 10 | ||
| 1 | 7 | ||
| 2 | 19 | ||
| 3 | 24 | ||
| 4 | 23 | ||
| 5 | 8 | ||
| ≥6 | 10 | ||
| First-degree relative with breast cancer (%) | 19 | 13 | |
| First- or second-degree relative with breast cancer (%) | 33 | 16 |
Abbreviation: IQR, interquartile range.
Among parous women only.