Fig 4. ORs and 95% CIs for breast cancer in women last prescribed an IUD versus women with no contraceptive prescriptions.

Data from the CPRD. All ORs are versus women with no recorded prescriptions for either a hormonal contraceptive or nonhormonal IUD during the observation period. Numbers may vary from previous analyses as women whose last contraceptive prescription was for a nonhormonal IUD are considered under this category, even if they had previously received a hormonal contraceptive prescription. Adjusted ORs are adjusted for time since last birth, number of recorded births, BMI, and alcohol intake. P values are based on the relevant Wald tests. BMI, body mass index; CI, confidence interval; CPRD, Clinical Practice Research Datalink; IUD, intrauterine device; OR, odds ratio.