Table 1.
Positive predictive value of serrated polyps in Swedish histopathology reports
| Variable | SNOMED codes M8213(0)/M8216(0) | Free text “serrated” | Total |
|---|---|---|---|
| Individuals | 52 (49%) | 76 (72%) | 106 (100%) |
| By subtype | |||
| Hyperplastic polyp | 5 (10%) | 31 (41%) | 34 (32%) |
| Traditional serrated adenoma | 2 (4%) | 3 (4%) | 3 (3%) |
| Sessile serrated adenoma/polyp | 49 (94%) | 40 (53%) | 70 (66%) |
| Unspecified serrated polyp | 0 (0%) | 3 (4%) | 3 (3%) |
| False positive serrated polyp | 0 (0%) | 5 (7%) | 5 (5%) |
| PPV, SP diagnosis | 52/52, 100% (95%CI = 93–100%) | 71/76, 93% (95%CI = 86–97%) | 101/106, 95% (95%CI = 89–98%) |
| By year of diagnosis | |||
| < 2000 | 0/0 | 17/19, 89% | 17/19, 89% |
| 2000–2009 | 16/16, 100% | 10/11, 91% | 25/26, 96% |
| ≥ 2010 | 36/36, 100% | 44/46, 96% | 59/61, 97% |
| PPV, location | 49/52, 94% (95%CI = 84–98%) | – | – |
| By topography code | |||
| T67 | 25/25, 100% | – | – |
| T671 | 1/1, 100% | – | – |
| T672 | 3/3, 100% | – | – |
| T677 | 2/2, 100% | – | – |
| T68 | 18/21, 86% | – | – |
| PPV, SSA/P diagnosis | 49/52, 94% (95%CI = 84–98%) | – | – |
Abbreviations: CI = Confidence interval; PPV = Positive predictive value; SP = Serrated polyp; SNOMED = Systematised Nomenclature of Medicine