Table 1.
Baseline characteristics of female participants in the SUN Project, according to binge drinking habit.
| Variable | No Binge Drinking | Binge Drinking |
|---|---|---|
| n (%) * | 7285 (76.1) | 2292 (23.9) |
| Age (years) | 36 (10.6) | 29.8 (7.8) |
| Body-mass index (kg/m2) | 22.3 (3.0) | 22 (2.9) |
| Height (cm) | 163 (6) | 165 (5.9) |
| Physical activity (MET-h/week) | 20 (18.5) | 20.9 (19.7) |
| Total energy intake (kcal/day) | 2303 (574) | 2304 (563) |
| Alcohol intake (g/day) | 6.5 (10.7) | 9.7 (12.7) |
| Sugar-sweetened beverages (servings/day) | 0.16 (0.33) | 0.22 (0.32) |
| Lifetime breast-feeding (months) | 3.1 (5.5) | 1.2 (3.2) |
| Adherence to Mediterranean diet score | 4.1 (1.7) | 4.1 (1.7) |
| Time of university education (years) | 4.8 (1.4) | 4.7 (1.2) |
| Age of menarche (%) | ||
| <10 years | 20.3 | 19.4 |
| 10–16 years | 71.7 | 72.5 |
| >16 years | 8 | 8.1 |
| Menopause (%) | 12.8 | 2.9 |
| Obstetric history (including age at first pregnancy) (%) | ||
| Age < 25 years & nulliparous | 15.2 | 28.2 |
| Age ≥ 25 years & nulliparous | 47.5 | 53.8 |
| First pregnancy before 25 years | 5.3 | 1.6 |
| First pregnancy between 25 & 30 years of age | 16.7 | 7 |
| First pregnancy being 30 years old or older | 15.3 | 9.4 |
| Time of hormone-replacement therapy (months) | 1.2 (2.3) | 1.6 (2.4) |
| Smoking (%) | ||
| Never | 55.5 | 37.5 |
| Current | 23 | 43.5 |
| Former | 21.5 | 19 |
| Lifetime tobacco exposure (pack-years) | 4 (7.7) | 4.7 (7.2) |
| Family history of Breast Cancer (%) | ||
| None | 89.2 | 90.2 |
| Before the age of 45 years | 8.8 | 8.2 |
| After the age of 45 years | 2 | 1.6 |
* Values represent means (standard deviations), unless otherwise stated.