Studies Included	Comments	Conclusions
All RCTs* reporting results from 11–20 years of follow-up	Mortality reductions ranged from no significant effect to 32% reduction in breast cancer mortality. Meta-analysis performed by AHRQ found a significant reduction in mortality from breast cancer.	USPSTF recommends screening mammography, with or without clinical breast examination, every 1–2 years for women aged 40 years and older.

^*RCT indicates randomized controlled trial.