Use of Insulin and Mortality from Breast Cancer among Taiwanese Women with Diabetes

Table 1

Baseline characteristics of women with diabetes who died and those who did not die of breast cancer.

Variable	Died of breast cancer		P value
	No	Yes
= 48,880	48,709	171
Age, years	61.1 (11.6)	63.6 (9.9)	0.0013
Age, years
<45	4,010 (8.2)	4 (2.3)	0.0050
45–64	25,251 (51.8)	84 (49.1)
≥65	19,448 (39.9)	83 (48.5)
Diabetes duration, years	7.5 (6.6)	8.5 (7.6)	0.0706
Diabetes type, % type 1	1,770 (3.6)	5 (2.9)	0.6204
Body mass index, kg/m^2	24.7 (3.8)	24.3 (4.0)	0.2315
Smoking, % yes	1,669 (3.4)	6 (3.5)	0.9529
Use of insulin, %
Non-users	43,546 (89.4)	150 (87.7)	0.1229
Use for <3 years	1,891 (3.9)	3 (1.8)
Use for 3–4.9 years	842 (1.7)	5 (2.9)
Use for ≥5 years	2,430 (5.0)	13 (7.6)
Area of residence, % urban	22,374 (45.9)	94 (55.0)	0.0179
Median duration of follow-up, years	7.4	3.7
Median duration of insulin use in insulin users, years	4.0	6.0

Data are expressed as mean (SD) or (%).
Median follow-up duration: 7.3 years and 7.5 years for insulin users and non-users, respectively.