Table 5.

Hazard ratios of 10-year breast cancer mortality associated with mammography screening among non-Hispanic white women and black women age 69–84 years

White women	Dead (n=6,303)		Alive or Censored (n=53,195)
	n	%	n	%	HRa	95% CIb
Mammography screening
No/Irregular	4358	69.1	22476	42.3	1.00	(referent)
Biennial	782	12.4	9584	18.0	0.47	(0.44–0.51)
Annual	1163	18.5	21135	39.7	0.31	(0.29–0.33)
p-value for trend						<0.0001

Black Women	Dead (n= 824)		Alive or Censored (n=4,062)
	n	%	n	%	HRa	95% CIb
Mammography screening
No/Irregular	633	76.8	2245	55.2	1.00	(referent)
Biennial	91	11.0	770	19.0	0.47	(0.37–0.58)
Annual	100	12.2	1047	25.8	0.36	(0.29–0.44)
p-value for trend						<0.0001

^aHazard ratios adjusted for AJCC stage, radiation therapy, chemotherapy, co-morbid conditions and contextual socio-economic status.

^b95% Confidence interval.