Table 3 The frequency of colonoscopies performed for the different spot positivity percentages (SP%)

From: Optimising faecal occult blood screening:retrospective analysis of NHS Bowel Cancer Screening data to improve the screening algorithm

SP% (Episode 2)

No (%)

Cumulative, no (%)

11%

286 (7.4)

286 (7.4)

17%

847 (21.8)

1133 (29.1)

22%

241 (6.2)

1374 (35.3)

25%

693 (17.8)

2067 (53.1)

28%

106 (2.7)

2173 (55.8)

33%

564 (14.5)

2737 (70.3)

39%

21 (0.5)

2758 (70.9)

42%

289 (7.4)

3047 (78.3)

44%

9 (0.2)

3056 (78.5)

50%

230 (5.9)

3286 (84.5)

56%

0 (0)

3286 (84.5)

58%

121 (3.1)

3407 (87.6)

67%

68 (1.7)

3475 (89.3)

75%

32 (0.8)

3507 (90.1)

83%

176 (4.5)

3683 (94.7)

100%

208 (5.3)

3891 (100)

  1. The cumulative column showed that SP%s ⩽25% accounted for 53.1% of all colonoscopies.
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