| Risk factor | Undergraduate | Graduate | Total |
| Family history of breast cancer | 12 (4.8%) | 6 (2.4%) | 18 (7.2%) |
| Diet and diet related factors | 2 (0.8%) | 5 (2.0%) | 7 (2.8%) |
| Hormones and reproductive factors | 3 (1.2%) | 8 (3.2%) | 11 (4.4%) |
| Ionizing radiations | Nil | Nil | 00 |
| Benign breast diseases | 15 (6.0%) | 21 (8.4%) | 36 (14.4%) |
| Increasing with age (age at menarche) | 5 (2.0%) | 3 (1.2%) | 8 (3.2%) |
| Gender (being female) | 21 (8.4%) | 13 (5.2%) | 34 (13.6%) |
| Lack of exercise | 9 (3.6%) | 14 (5.6%) | 23 (9.2%) |