Table 1. Preoperative characteristics of the 652 patients.
| All patients | |||
|---|---|---|---|
| Median or % | IQR | Missing | |
| Age at diagnosis (years) | 59.6 | 50.7–67.0 | 0 |
| Height (cm) | 165 | 162–170 | 1 |
| Weight (kg) | 68 | 61–76 | 1 |
| Body mass index (BMI) (kg m−2) | 24.6 | 22.3–27.7 | 2 |
| Waist-to-hip ratio (WHR) | 0.83 | 0.78–0.88 | 4 |
| Total breast volume (cm3) | 1000 | 700–1600 | 9 |
| Age at menarche (years) | 13 | 12–14 | 5 |
| Premenopausal | 24.5% | 4 | |
| Age at menopause | 50 | 47–52 | 192 |
| Age at first full-term pregnancya | 24 | 21–28 | 96 |
| Parity | 2 | 1–3 | 0 |
| Ever oral contraceptive use | 70.1% | 0 | |
| Ever hormone replacement therapy use | 45.6% | 1 | |
| Abstainer of alcohol (%) | 12.1% | 1 | |
| Current smoker (%) | 22.0% | 1 | |
| Daily coffee consumption (cups) | 3 | 2–4 | 2 |
| 1° relative with breast cancer | 19.2% | 21 | |
Abbreviation: IQR=interquartile range.
a
Among parous women only.