Table 2.

Results of multivariate logistic regression for all breast cancer cases in women with SLE

Outcome	Multivariate prevalence, OR	95% CI
Lobular versus ductal carcinoma
Age at cancer diagnosis	1.07	1.01–1.14
SLE duration	0.99	0.90–1.08
Calendar period	0.56	0.11–2.88
Special subtypes versus ductal carcinoma
Age at cancer diagnosis	1.06	1.01–1.10
SLE duration	1.05	1.00–1.11
Calendar period	0.60	0.18–2.05

Two outcomes were modeled: lobular versus ductal breast cancer and special histological subtypes versus ductal cancer (n = 120). Each model included the three variables listed. Age was a continuous variable. SLE duration was assessed at cancer diagnosis, categorical (≤5 years’, 5–10 years’, and >10 years’ duration). Calendar year period in which cancer occurred was dichotomized (≤1990 and >1990).