PGR and breast carcinoma: The OR per 1 exposure (intensity and duration) category increase was 1.42 (95% CI: 1.25–1.62; Ptrend < 0.001) and 1.54 (95% CI: 1.28–1.86; Ptrend < 0.001), respectively, for ER+, 1.20 (95% CI: 1.00–1.43; Ptrend = 0.05) and 1.41 (95% CI: 1.10–1.83; Ptrend = 0.01), respectively, for ER-, 1.34 (95% CI: 1.15–1.56; Ptrend < 0.001) and 1.47 (95% CI: 1.18–1.83; Ptrend < 0.001), respectively, for PR+, and 1.36 (95% CI: 1.19–1.57; Ptrend < 0.001) and 1.53 (95% CI: 1.25–1.87; Ptrend < 0.001), respectively, for PR- breast cancer.