Recent breast cancer incidence trends according to hormone therapy use: the California Teachers Study cohort

Breast Cancer Research

Table 1 Age-standardized baseline characteristics of menopausal women in the California Teachers Study according to hormone therapy (HT) use in 1995-1996

	Never HT (n = 14,070)	Past HT (n = 7914)	Current E (n = 15,407)	Current EP (n = 16,934)
Mean age in years	66.5	68.2	63.3	58.9
% Non-Hispanic white	85.3	87.9	90.1	92.2
% First-degree family history of breast cancer	15.2	14.9	13.2	12.2
% BMI overweight or obese ≥25 kg/m²	45.2	45.2	41.6	34.9
% High alcohol intake (average ≥20 g/day)	8.6	9.3	9.5	10.4
% Highest quartile of residential socioeconomic status	44.4	44.8	47.5	52.5
% Menarche at age 11 years or younger	22.0	23.4	23.6	20.9
% Nulliparous	23.5	19.5	18.8	19.5
% Parous before age 35 years	70.2	74.8	76.3	75.1

BMI = body mass index; E = estrogen only; EP = estrogen and progestin combined therapy.
Age-standardized by 10-year age categories to the age distribution of menopausal women in analysis

ISSN: 1465-542X