Figure 2.2.

Hazard ratios of premenopausal breast cancer by somatotype at age 10 and BMI at age 18, NHS II 1991–2009.

*Hazard ratio compared with the reference group (somatotype at age 10 diagram 2 and BMI at age 18 of 20–22.4 kg/m²) is statistically significant at alpha = 0.05.The analysis was adjusted for age, birthweight, premature birth, age at menarche, height, current BMI, family history of breast cancer, history of benign breast disease, parity, age at first birth, oral contraceptive use, alcohol consumption and physical activities.The incidence rate is not estimable for the group with somatotype at age 10 ranked as 1 and BMI at age 18 of 25–27.4 kg/m² due to sparse sample size.