Table 5. Programme sensitivity.

	Person-years	Observed interval cancers	Expected cancers	2-year sensitivity (1-O/E) (%)	95% confidence intervals
Time since last test (months)
0–11	27,220	7	36.29	80.7	60.3–92.2
12–23	19,127	11	26.96	59.2	27.0–79.6
Age
50–59	21,552	8	17.45	54.2	9.7–80.2
60–70	24,795	10	45.78	78.2	59.8–89.5
Gender
Males	22,108	8	38.52	79.2	59.1–91.0
Females	24,239	10	24.72	59.6	25.6–80.6
Site
Colon	46,347	13	41.80	68.9	46.8–83.4
Rectum	46,347	5	21.44	76.7	45.6–92.4
Rank of screening
First	18,232	10	24.48	59.2	24.9–80.4
Subsequent	28,115	8	38.76	79.4	59.3–91.1
Total	46,347	18	63.24	71.5	55.0–83.1

Person-years, observed interval cancers, expected colorectal cancers and screening sensitivity by time since last test, age groups, gender, subsite, and rank of screening, with a 2-year period of observation following a negative latex test or a positive-latex test followed by a negative assessment.