Table 3.

Subgroup analysis of risk of breast cancer.

	Mastitis		Non-Mastitis
	N	No. of Breast Cancer Events	N	No. of Breast Cancer Events	HR	95% CI	p Value
Age
20–50	390	5	4364	21	2.66	1.00–7.05	0.049
≥50	344	8	3536	15	5.46	2.31–12.87	<0.001
Hypertension
No	583	12	6507	35	3.84	2.00–7.41	<0.001
Yes	151	1	1393	1	9.10	0.57–145.52	0.118
Hyperlipidemia
No	616	9	6963	30	3.41	1.62–7.19	0.001
Yes	118	4	937	6	4.88	1.38–17.31	0.014
Diabetes
No	667	10	7247	35	3.09	1.53–6.25	0.002
Yes	67	3	653	1	28.45	2.96–273.49	0.004
Hyperthyroidism
No	721	13	7785	36	3.88	2.06–7.31	<0.001
Yes	13	0	115	0	NA	NA	NA
Hypothyroidism
No	724	13	7827	35	4.00	2.12–7.56	<0.001
Yes	10	0	73	1	NA	NA	NA
Autoimmune diseases
No	716	13	7717	35	4.00	2.12–7.56	<0.001
Yes	18	0	183	1	NA	NA	NA

NA: not applicable.