Table 4.

Incremental Cost-effectiveness of Biennial Breast Cancer Screening in Older Women with Life Expectancies in the Top 25% (Physiologic Age)^*

Strategy	Life Expectancy (Years)	Incremental Life Expectancy (Years)	Costs	Incremental Costs	Incremental Costs per LYS
Costs per LYS
50–70 y	23.493	–	$3,327.632324	–	–
50–79 y	23.079	.006799338	$3,721.545166	$393.912842	$57,934
Lifetime	23.072	.003459292	$4,159.591797	$438.046631	$126,629

^*Costs and effects discounted at 3%. Life expectancy based on health for screening women who are in the top 25% of life expectancies for their ages.Each strategy is considered compared to the next least expensive approach.

LYS, life years saved.