Table 4.

Phase 2 attendance (%) of tests occurring within 12 months and 18 months since standard invite.

Phase 2 intervention	Attendance percent (freq/n)	ORa	95% CI	P valueb	ICCc
12 months (4.5 months since Phase 2 intervention)
Control	16.2 (613/3782)	–	–	–	0.0083
Self-sample sent	21.3 (243/1141)	1.512	1.197, 1.910	0.001
Self-sample off.	16.2 (209/1290)	1.074	0.871, 1.325	0.505
Nurse navigator	14.5 (146/1007)	0.887	0.670, 1.174	0.401
Timed appt.	19.8 (323/1629)	1.408	1.141, 1.738	0.001
Choice	18.8 (240/1277)	1.091	0.864, 1.378	0.466
Total	17.5 (1774/10,126)	–	–	<0.001d	–
18 months (10.5 months since Phase 2 intervention)
Control	27.1 (1026/3782)				0.0211
Self-sample sent	30.0 (342/1141)	1.286	1.056, 1.567	0.012
Self-sample off.	25.8 (333/1290)	1.056	0.884, 1.262	0.548
Nurse navigator	22.8 (230/1007)	0.799	0.642, 0.994	0.044
Timed appt.	29.0 (472/1629)	1.191	0.975, 1.456	0.087
Choice	30.2 (385/1277)	1.058	0.869, 1.289	0.573
Total	27.5 (2788/10,126)	–	–	0.008d	–

OR: odds ratios; ICC: intra-cluster correlation.

^aOR Adjusted Odds Ratio associated with the change in odds of attendance occurring within intervention compared to control, adjusted for practice attendance rate and PCT region.

^bComparison of each intervention against control. To maintain an overall 5% level, these can be interpreted with a 1% significance level.

^cIntra-cluster correlation coefficient indicating level of agreement between GP clusters as defined by the logistic GEE model.

^dOverall ${\chi }_5^2$ p value comparing all trial arms in Phase 2.