Piloting the Impact of Three Interventions on Guaiac Faecal Occult Blood Test Uptake within the NHS Bowel Cancer Screening Programme

Table 2

Multivariate logistic regression model for gFOBT uptake amongst 60–69-year-olds ( = 168,980).

Adequately screened at 12 weeks	Odds ratio	value	95% lower confidence limit	95% upper confidence limit
Intervention group; (reference = control group)
A	0.99	0.680	0.92	1.05
B	1.07	0.047	1.00	1.15
C	1.09	0.027	1.01	1.18
D	1.28	<0.001	1.18	1.39
Contamination variable; (reference = uncontaminated)
Contaminated-control	1.09	0.006	1.03	1.17
Contaminated-A	1.26	0.001	1.10	1.44
Contaminated-B	1.29	0.001	1.11	1.51
Age at invitation; (reference = 60 years)	1.004	0.353	1.00	1.01
Previous screening status; (reference = previously screened)
First-timers	0.17	<0.001	0.16	0.18
Previous nonresponders	0.05	<0.001	0.05	0.06
Interaction term: previous screening status × age at invitation
First-timers	0.94	<0.001	0.92	0.96
Previous nonresponders	0.91	<0.001	0.90	0.93
IMD score	0.98	<0.001	0.98	0.99
Gender; (reference 0 = female, 1 = male)	0.83	<0.001	0.81	0.85
Date the kit was sent (days)	0.9997	<0.001	1.00	1.00
Constant	5653.54	<0.001	1369.18	23344.31