Table 4. Relative risk (hazard ratios) of CIN2+ and 95% CI, adjusted for screening programme and interval between index and last screening episode.

Factors	Level	Relative risk (95% CI)
No. of previous screening episodes	1 (referent)	1
	2	1.10 (0.95–1.28)
	3	0.96 (0.78–1.19)
	4	0.70 (0.51–0.97)
	5	0.65 (0.45–0.92)
Age	25–49 years (referent)	1
	50–64 years	0.29 (0.24–0.35)

CI=confidence interval; CIN=cervical intraepithelial neoplasia.

Test for trend on risks referring to n screening episodes: P-value>0.5.