Table III.

Relative risk of breast cancer deaths in women screened with mammography compared to the unscreened women or women screened with alternative screening tests (e.g. clinical breast examination) in the meta-analyses of randomized clinical trials evaluating the efficacy of mammography screening

Meta-analysis reference (yr)	Age at entry (yr)	RR of breast cancer deaths	95% CI
IARC (2002)43 (excluded trials with CBE screening)	40-49	0.81	0.65-1.01
	50-69	0.75	0.67-0.85
Nelson et al44	39-49	0.85	0.75-0.96
	50-59	0.86	0.75-0.99
	60-69	0.68	0.54-0.87
	70-74	1.12	0.73-1.72
Tonelli et al45	40-49	0.85	0.75-0.96
	50-69	0.79	0.68-0.90
	70-74	0.68	0.45-1.01
Magnus et al46	39-49	0.83	0.72-0.97
Gøtzsche and Jørgensen47	39-49	0.84	0.73-0.96
	≥50	0.77	0.69-0.86
Marmot et al48	40-74	0.80	0.73-0.89

CBE, clinical breast examination; CI, confidence interval; RR, relative risk; IARC, International Agency for Research on Cancer