Table 3. Relative risk of breast cancer according to body mass index of 14,684 women.

	Mean ± SD	No. of BC	Population (%)	RR	95% CI	p-value
BMI (kg/m2), categorical
< 18.5	16.2 ± 1.3	0	79 (0.6)	0	-	-
18.5–24.9	22.6 ± 2.2	139	6,183 (42.1)	1.0	-	-
25–29.9	27.2 ± 1.4	149	5,762 (39.2)	1.17	0.92–1.47	0.180
≥ 30	33.5 ± 3.2	78	2, 660 (18.1)	1.32	1.00–1.75	0.040
BMI, continuous*	-	-	-	1.21	1.05–1.40	0.008

BMI=body mass index; BC=breast cancer; RR=relative risk; CI=confidence interval.

^*Linear trend.