TABLE III.

Proportion of patients with a prior mammogram who died of breast cancer before age 60, by years elapsed since study entry

Time since study entry (years)	Deaths (n)	Prior mammogram
		(n)	(%)
0–1	0	0	—
1–2	0	0	—
2–3	6	4	66.7
3–4	10	5	50.0
4–5	16	9	56.3
5–6	11	9	81.8
6–7	16	8	50.0
7–8	22	13	59.1
8–9	19	9	47.4
9–10	22	13	59.1
10–11	26	13	50.0
11–12	25	7	28.0
12–13	18	5	27.8
13–14	22	12	54.6
14–15	15	9	60.0
15–16	10	8	80.0
16–17	9	7	77.8
17–18	7	2	28.6
18–19	1	0	0
19–20	1	1	100