PGR and breast cancer: Compared to women exposed to noise levels < 48 dB, women exposed to noise levels > 58 dB had 59% (HR; 95% CI, 1.59; 1.14–2.20) and 66% (HR; 95% CI, 1.66; 1.14–2.40) higher risk of developing ER+ and PR+ BC, respectively.