Table 1. Patient characteristics in relation to smoking status at the preoperative visit.
| All |
Smoker at the preoperative visita |
||||
|---|---|---|---|---|---|
| Median (IQR) or % |
Median (IQR) or % |
||||
| Yes | No | ||||
| n=1065 | Missing | n=223 (21.0%) | n=840 (79.0%) | P-value | |
| Age at diagnosis (years) | 61.3 (52.3–68.1) | 0 | 59.0 (51.3–65.4) | 61.9 (52.7–69.0) | <0.001 |
| Year of birth | 1946 (1940–1955) | 0 | 1948 (1943–1956) | 1945 (1940–1954) | 0.001 |
| Weight (kg) | 69.0 (62.0–78.0) | 27 | 66.6 (60.0–76.0) | 70.0 (62.0–78.5) | <0.001 |
| Height (m) | 1.65 (1.62–1.70) | 27 | 1.65 (1.62–1.69) | 1.65 (1.62–1.70) | 0.76 |
| BMI (kg m−2) | 25.1 (22.5–28.3) | 29 | 24.4 (21.7–27.2) | 25.2 (22.7–28.7) | <0.001 |
| Waist-to-hip ratio | 0.86 (0.81–0.90) | 39 | 0.87 (0.82–0.90) | 0.85 (0.81–0.90) | 0.09 |
| Total breast volume (ml)b | 1000 (650–1500) | 167 | 800 (600–1300) | 1000 (700–1600) | <0.001 |
| Age at menarche (years) | 13 (12–14) | 6 | 13 (12–14) | 13 (12–14) | 0.55 |
| Parous | 87.9% | 1 | 85.7% | 88.6% | 0.24 |
| Parity | 2 (1–3) | 1 | 2 (1–2) | 2 (1–3) | 0.06 |
| Age at first full-term pregnancy (years)c | 25 (22–28) | 136 | 23 (20–26) | 25 (22–28) | <0.001 |
| Alcohol abstainer | 10.5% | 7 | 7.2% | 11.4% | 0.07 |
| Ever treated for menopausal symptoms | 44.4% | 3 | 39.0% | 46.0% | 0.06 |
| Ever use of oral contraceptives | 70.7% | 1 | 78.0% | 68.8% | 0.007 |
Abbreviations: BMI=body mass index; IQR=interquartile range.
a
Smoking status missing for two patients.
b
In patients without previous breast surgery.
c
In parous patients. The bold numbers indicate statistical significance.