Obesity as risk factor for subtypes of breast cancer: results from a prospective cohort study

BMC Cancer

Table 2 Hazard ratios of overall breast cancer across tertiles of BMI^a

	Postmenopausal non-users of HT^b			Postmenopausal users of HT^b			Pre- and perimenopausal women^b
	Cases (n)	HR	CI (95%)	Cases (n)	HR	CI (95%)	Cases (n)	HR	CI (95%)
Tertile 1	14	1		65	1		141	1
Tertile 2	43	1.87	(1.00,3.49)	92	0.97	(0.70,1.34)	85	0.76	(0.57,1.00)
Tertile 3	79	2.28	(1.23,4.16)	56	0.69	(0.47,1.00)	82	0.93	(0.70,1.24)
Per 5 kg/m ²		1.27	(1.07,1.50)		0.80	(0.66,0.98)		0.98	(0.85,1.12)
p trend		0.005			0.024			0.72

Median (p25, p75) values of BMI: Tertile 1: 21.4 (20.4, 22.3), Tertile 2: 24.8 (23.9, 25.7); Tertile 3: 29.9 (28.1, 32.7)
^aFrom Cox regression models adjusted for height, number of full-term pregnancies, pill use, education level, smoking status, and study center
^bAt baseline (HT hormone therapy)

ISSN: 1471-2407