Table 3. Predicted survival benefit with chemotherapy for women aged 70 years and over.

Age	N	Predicted 10-year survival without chemo (%)	Predicted 10-year survival with chemo (%)	Mean absolute mortality benefit (%)*	Proportion with ≥3% benefit (%)	Proportion with ≥5% benefit (%)	Observed actual percent that received adjuvant chemo
70–74	3,955	57.9	62.x	2.9	39.6	19.2	18.2
75–79	3,131	45.8	49.6	3.1	44.2	18.9	7.3
80–84	1,784	32.x	35.4	3.x	46.4	17.3	1.5
85–99	681	17.3	20.4	3.x	48.8	9.7	0.6
90–95	95	6.x	8.6	2.7	43.2	0	0

*Percentage point improvement in survival at 10 years.

chemo, chemotherapy.