Table 4.
Diagnostic performances of the eleven endoscopists in predicting polyp histology subdivided according to level of experience, location, size, morphology and image quality
| Sensitivity | Specificity | Accuracy | PPV1 | NPV1 | |
| Overall | 79.3 ± 7.0 | 85.7 ± 9.6 | 81.1 ± 4.7 | 84.7 | 80.5 |
| Experience | |||||
| GE | 76.4 ± 6.6 | 82.1 ± 9.2 | 78.0 ± 3.7 | 81.0 | 77.7 |
| Trainees | 81.0 ± 7.1 | 87.8 ± 9.9 | 82.9 ± 4.5 | 86.9 | 82.2 |
| P value | 0.320 | 0.378 | 0.098 | ||
| Location | |||||
| Proximal | 74.6 ± 30.9 | 80.0 ± 29.7 | 75.6 ± 30.1 | 78.9 | 75.9 |
| Distal | 84.2 ± 29.0 | 88.9 ± 8.8 | 86.0 ± 23.4 | 88.4 | 84.9 |
| P value | 0.353 | 0.547 | 0.187 | ||
| Size | |||||
| Diminutive | 63.2 ± 33.3 | 90.2 ± 7.8 | 74.2 ± 29.1 | 86.6 | 71.0 |
| Non-diminutive | 97.2 ± 7.2 | 27.32 | 93.1 ± 18.3 | 57.2 | 90.7 |
| P value | < 0.001 | 0.008 | |||
| Morphology | |||||
| Polypoid | 81.8 ± 25.1 | 85.1 ± 20.0 | 83.1 ± 23.0 | 84.6 | 82.4 |
| Non-polypoid | 75.4 ± 35.0 | 87.9 ± 13.9 | 77.3 ± 32.8 | 86.2 | 78.1 |
| P value | 0.536 | 0.829 | 0.470 | ||
| Image quality | |||||
| Excellent | 89.3 ± 23.1 | 93.5 ± 6.9 | 90.3 ± 20.3 | 93.2 | 89.7 |
| Good | 63.6 ± 33.3 | 77.9 ± 23.4 | 68.4 ± 30.5 | 74.2 | 68.2 |
| P value | 0.010 | 0.117 | 0.007 |
Data are expressed as mean ± SD.
1
Based on our sensitivity and specificity data and literature data regarding prevalences of non-adenomatous and adenomatous polyps;
2
Based on 1 case only, no statistics performed. GE: Gastroenterologist; PPV: Positive predictive value; NPV: Negative predictive value.