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

Table 3

Multivariate logistic regression model for gFOBT uptake amongst 70–74-year-olds ( = 36,561).

Adequately screened at 12 weeks	Odds ratio	value	95% lower confidence limit	95% upper confidence limit
Intervention group; (reference = control group)
A	0.94	0.381	0.81	1.08
B	1.03	0.739	0.89	1.19
C	0.88	0.318	0.69	1.13
D	1.34	0.001	1.13	1.59
Contamination variable; (reference = uncontaminated)
Contaminated-control	1.03	0.806	0.84	1.26
Contaminated-A	1.08	0.725	0.72	1.61
Contaminated-B	1.03	0.906	0.64	1.67
Age at invitation; (reference = 70 years)	0.96	0.001	0.94	0.98
Previous screening status; (reference = previously screened)
First-timers	0.09	<0.001	0.07	0.12
Previous nonresponders	0.02	<0.001	0.02	0.02
Interaction term: previous screening status × age at invitation
First-timers	1.12	0.018	1.02	1.24
Previous nonresponders	1.24	<0.001	1.19	1.29
IMD score	0.99	<0.001	0.98	0.99
Date the kit was sent (days)	0.9996	<0.001	1.00	1.00
Constant	11733.30	<0.001	484.95	283884.90