Table 7.

Case-only ORs and 95% CIs from logistic regression models of the associations between breast cancer tumor subtypes and BMI.

BMI	Luminal A comparison	Luminal B			Her2+			TN
	n	n	OR	95% CI	n	OR	95% CI	n	OR	95% CI
UW	34	9	1.00	Reference	7	1.00	Reference	16	1.00	Reference
NW	322	118	1.38	0.65–2.97	74	1.12	0.48–2.62	128	0.85	0.45–1.58
OW	143	42	1.11	0.49–2.50	26	0.88	0.35–2.20	66	0.98	0.51–1.90
OB	30	8	1.01	0.35–2.94	4	0.65	0.17–2.43	13	0.92	0.38–2.22
Subtotal	529	177			111			223
Premenopausal
UW	21	6	1.00	Reference	4	1.00	Reference	4	1.00	Reference
NW	155	63	1.42	0.55–3.69	27	0.92	0.29–2.87	47	1.59	0.52–4.87
OW	49	17	1.21	0.42–3.51	13	1.39	0.41–4.77	24	2.57	0.79–8.33
OB	9	2	0.78	0.13–4.62	2	1.17	0.18–7.56	11	6.42**	1.61–25.64
Subtotal	234	88			46			86
Postmenopausal
UW	13	3	1.00	Reference	3	1.00	Reference	12	1.00	Reference
NW	167	55	1.43	0.39–5.19	47	1.22	0.33–4.46	81	0.53	0.23–1.20
OW	94	25	1.15	0.31–4.36	13	0.60	0.15–2.39	42	0.48	0.20–1.15
OB	21	6	1.24	0.26–5.83	2	0.41	0.06–2.81	2	0.10**	0.02–0.54
Subtotal	295	89			65			137

OR, odds ratio; CI, confidence interval; BMI, body mass index; Her2, human epidermal growth factor receptor 2; TN, triple-negative; UW, underweight; NW, normal weight; OW, overweight; OB, obese.

*P < 0.05; **P < 0.01 vs the UW group.

Reference: luminal A is regarded as the reference as the most common subtype.