Table 6. Cumulative risk (CR), probabilities of cytological and histological false-positive diagnosis and of true positive per 10 000, ratio between true-positive and false-positive, ratio between CR and false-positive, by screening episodes, for different combination of cytological and histological specificities.

	CR (per 10 000)			True positive (per 10 000)		True positive/false positive		Positive/false positive
No. of screening episodes	25–49 (years)	50–64 (years)	False positive (per 10 000)	25–49 (years)	50–64 (years)	25–49 (years)	50–64 (years)	25–49 (years)	50–64 (years)
Cytological specificity: 0.97, histological specificity: 0.94 or cytological specificity: 0.94, histological specificity: 0.97
1	206	36	18.00	188.00	18.00	10.44	1	11.44	2
2	246	38	17.97	228.03	20.03	12.69	1.11	13.69	2.11
3	274	36	17.94	256.06	18.06	14.28	1.01	15.28	2.01
4	305	23	17.90	287.10	5.10	16.04	0.28	17.04	1.28
5	206	23	17.87	188.13	5.13	10.53	0.29	11.53	1.29
Cytological specificity: 0.96, histological specificity: 0.95 or cytological specificity: 0.95, histological specificity: 0.96
1	206	36	20.00	186.00	16.00	9.30	0.80	10.30	1.80
2	246	38	19.96	226.04	18.04	11.32	0.90	12.32	1.90
3	274	36	19.92	254.08	16.08	12.75	0.81	13.75	1.81
4	305	23	19.88	285.12	3.12	14.34	0.16	15.34	1.16
5	206	23	19.84	186.16	3.16	9.38	0.16	10.38	1.16