Accuracy of Colposcopically Directed Biopsy: Results from an Online Quality Assurance Programme for Colposcopy in a Population-Based Cervical Screening Setting in Italy

Table 1

Nonbiopsy and incorrect selection of biopsy site according to the colposcopic impression formulated by the committee.

	Committee decision on biopsy according to colposcopic impression					Total
	Biopsy: no; (negative)	Biopsy: yes
		G1	G2	Cancer	Subtotal
Colposcopist decision on biopsy
No	803	64	12	0	76	879
Yes, incorrect site	NA	58	85	2	145	145
Yes, correct site	NA	468	1024	234	1726	1726
Yes, subtotal	200	526	1109	236	1871	2071
Total	1003	590	1121	236	1947	2950
Nonbiopsy rate	NA	0.11 (0.08–0.13)	0.01 (0.01-0.02)	0.00 (0.00–0.02)	0.04 (0.03–0.05)	NA
Incorrect biopsy site rate	NA	0.10 (0.08–0.12)	0.08 (0.06–0.09)	0.01 (0.00–0.03)	0.07 (0.06–0.09)	NA
Total biopsy failure rate	NA	0.21 (0.17–0.24)	0.09 (0.07–0.11)	0.01 (0.00–0.03)	0.11 (0.10–0.13)	NA

G1: abnormal, grade 1; G2: abnormal, grade 2; Cancer: suspected invasive cancer.