Changes in the accuracy of brush cytology during the study period
| Patients | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|
| NPV, negative predictive value; PPV, positive predicitive value. | ||||
| 1–135 | 35/79 (44.3) | 54/56 (96.4) | 35/37 (94.6) | 54/98 (55.1) |
| 136–270 | 47/75 (62.7) | 60/60 (100) | 47/47 (100) | 60/88 (68.2) |
| 271–406 | 65/92 (70.7) | 43/44 (97.7) | 65/66 (98.5) | 43/70 (61.4) |
| Overall | 147/246 (59.8) | 157/160 (98.1) | 147/150 (98) | 157/256 (61.3) |