Table 1 Characteristics of the study population
Mean | Standard deviation | |
|---|---|---|
Age (years) | 62.8 | 5.7 |
Height (cm) | 152.9 | 5.5 |
Body mass index (kg/m2) | 23.4 | 2.9 |
Age at menarche (years) | 13.9 | 1.6 |
Age at menopause (years) | 50.0 | 3.8 |
Age at first birth (years)* | 26.2 | 3.3 |
Number | % | |
Family history of breast cancer, n (%) | 17 | 9.2 |
History of benign breast disease, n (%) | 11 | 6.0 |
Nulliparous, n (%) | 17 | 9.2 |
Number of births (4 or more births), n (%)* | 6 | 3.6 |
Breast feeding (yes), n (%)* | 154 | 93.3 |
Smoking (ever smoker), n (%) | 6 | 3.3 |
Alcohol drinking (drinker), n (%) | 67 | 36.2 |
Physical activity in past 5 years (yes), n (%) | 85 | 46.5 |