Breast Cancer Research

Table 1 Characteristics of no, past and current estrogen and progestin therapy (EPT) users (N = 2,036).

From: Polymorphisms in hormone metabolism and growth factor genes and mammographic density in Norwegian postmenopausal hormone therapy users and non-users

	No EPT (N= 1,176)			Past EPT (N= 612)			Current EPT (N= 248)
	N	Mean¹	SE²	N	Mean¹	SE²	N	Mean¹	SE²	P³
Mammographic density (%)	1,176	17.07	0.46	612	18.99	0.45	248	23.34	0.51	0.0001
Age at screening (years)	1,176	58.19	0.18	612	59.22	0.15	248	57.33	0.15	0.0001
Body mass index (kg/m ² )	1,176	25.44	0.13	612	24.91	0.10	248	24.15	0.11	0.0001
Age at menarche (years)	1,169	13.16	0.04	607	13.36	0.04	246	13.31	0.04	0.1025
Age at first pregnancy (years)	1,049	21.75	0.25	540	22.3	0.24	225	22.28	0.24	0.3602
Number of children	1,114	2	0.03	587	2	0.03	239	2	0.03	0.7252
Education (years)	1,164	12.75	0.10	605	13.01	0.10	245	12.85	0.10	0.2807

¹Adjusted for age and BMI, ²standard error, ³analysis of variance.

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