Table 2. Characteristics of lesions found at colonoscopy and iFOBT result (ng ml−1).
|
Range
|
Percentile
|
|||||||
|---|---|---|---|---|---|---|---|---|
| iFOBT positives (⩾50 ng ml−1) | N | (%) | Mean (95% CI) | Min | Max | 25th | Median | 75th |
| Without colonoscopy | 98 | (19) | 455 (326–583) | 52 | 2916 | 76 | 144 | 497 |
| With colonoscopy | 428 | (81) | 434 (377–492) | 50 | 4168 | 80 | 175 | 482 |
| Neither cancer nor adenomasa | 134 | (31) | 314 (239–388) | 50 | 2818 | 76 | 125 | 347 |
| Non-advanced Adenomasb | 105 | (25) | 356 (232–481) | 50 | 4168 | 69 | 109 | 326 |
| Advanced Adenomasc | 161 | (38) | 523 (420–627) | 52 | 3322 | 100 | 251 | 582 |
| Cancerd | 28 | (7) | 785 (563–1008) | 59 | 1871 | 283 | 662 | 1226 |
| Stage I or II cancer | 19 | (68) | 652 (400–904) | 59 | 1871 | 280 | 384 | 1099 |
| Stage III or IV cancer | 9 | (32) | 1066 (662–1470) | 202 | 1845 | 622 | 1182 | 1635 |
Abbreviation: iFOBT, immunochemical faecal occult blood test.
a
Neither cancer nor adenomas: colonoscopies without any lesions or only hyperplastic polyps, serrated adenomas or unclassified polyps.
b
Non advanced adenomas: colonoscopy with adenomas but without advanced adenomas and cancer.
c
Advanced adenomas: colonoscopies without cancer but with adenomas ⩾10 mm in size, high grade dysplasia or a villous component ⩾20%.
d
Staging according to TNM classification: there were only 4 stage II (all stage IIa, none stage IIb) and no stage IV patients. Therefore, stages I and II, and III and IV were combined.