. 2022 Dec 14;128(5):805–813. doi: 10.1038/s41416-022-02094-w

Table 2.

Absolute proportion in self-sampling arm, and relative proportion and difference in the opt-in vs. mail-to-all self-sampling invitation scenarios.

		Absolute participation		Relative participation	Participation difference
		Opt-in	Mail-to-all	Relative participation	Participation difference
Analysis	#	% (95% CI)	% (95% CI)	(95% CI)	% (95% CI)
Per-protocol	9	8.4 (5.8, 11.3)	18.3 (14.8, 22.1)	0.46 (0.40, 0.53)	−9.7 (−11.5, −8.0)
Intention-to-treat^*	9	15.6 (9.5, 22.9)	24.4 (19.4, 29.8)	0.61 (0.50, 0.74)	−8.2 (−10.8, −5.7)

*Certain studies reported that some women, allocated to the self-sampling arm, had a Pap smear taken. The sum of self-samples taken + Pap smears taken, were counted in the ITT analyses. In studies, where no such cases were reported, the number of events in the PP and ITT analyses were considered as equal.

^#Number of studies.