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. 2007 Apr 3;18(1):32–42. doi: 10.1007/s00330-007-0631-0

Table 5.

Per-patient performance overall and according to tagging regimen

Regimen Patient number Polyp ≥6 mm incl. cancer, n (%) [95% confidence limits] Polyp ≥10 mm incl. cancer, n (%) [95% confidence limits]
Sensitivity Specificity PPV NPV Sensitivity Specificity PPV NPV
A 23 3/4 (75%) [33–100%] 18/19 (95%) [85–100%] 0.75 0.95 3/4 (75%) [33–100%] 19/19 (100%) [100–100%] 1.0 0.95
B 23 7/7 (100%) [100–100%] 16/16 (100%) [100–100%] 1.0 1.0 3/3 (100%) [100–100%] 20/20 (100%) [100–100%] 1.0 1.0
C 23 3/3 (100%) [100–100%] 20/20 (100%) [100–100%] 1.0 1.0 1/1 (100%) [100–100%] 22/22 (100%) [100–100%] 1.0 1.0
D 20 5/7 (71%) [38–100%] 12/13 (93%) [78–100%] 0.83 0.86 3/3 (100%) [100–100%] 17/17 (100%) [100–100%] 1.0 1.0
Overall 89 18/21 (96%) [93–100%] 66/68 (97%) [93–100%] 0.9a 0.96 10/11 (91%) [74–100%] 78/78 (100%) [100–100%] 1.0b 0.99

NPV Negative predictive value, PPV positive predictive value

aPrevalence of abnormality = 0.24

bPrevalence of abnormality = 0.12