Table 2.
Nonbiopsy and incorrect selection of biopsy site according to original histological diagnosis.
| CIN1a | CIN2 | CIN3/AIS | Carcinoma | Total | |
|---|---|---|---|---|---|
| Colposcopist decision on biopsy | |||||
| No | 48 | 5 | 9 | 2 | 64 |
| Yes, incorrect site | 35 | 21 | 75 | 2 | 133 |
| Yes, correct site | 330 | 210 | 860 | 232 | 1632 |
| Yes, subtotal | 365 | 231 | 935 | 234 | 1765 |
| Total | 413 | 236 | 944 | 236 | 1829 |
| Nonbiopsy rate | 0.12 (0.09–0.15) | 0.02 (0.01–0.05) | 0.01 (0.00–0.02) | 0.01 (0.00–0.03) | 0.03 (0.03-0.04) |
| Incorrect biopsy site rate | 0.08 (0.06–0.12) | 0.09 (0.06–0.13) | 0.08 (0.06–0.10) | 0.01 (0.00–0.03) | 0.07 (0.06–0.09) |
| Total biopsy failure rate | 0.20 (0.16–0.24) | 0.11 (0.07–0.15) | 0.09 (0.07–0.11) | 0.02 (0.00–0.04) | 0.11 (0.09–0.12) |
CIN: cervical intraepithelial neoplasia; AIS: adenocarcinoma in situ.
aFifty-nine CIN1 cases were excluded from evaluation because the committee did not consider them worthy of biopsy based on colposcopic findings and, thus, did not classify the correctness of biopsy site as indicated (if any) by the colposcopists.