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

Table 1

Total sample of invitees in each intervention group and number included in the final multivariate logistic regression models.

Intervention group	Dates invited (control group)/dates kits sent (interventions)	Total sample of invitees aged 60–74 years (before exclusions)	Number of invitees aged 60–69 years (after exclusions)	Number of invitees aged 70–74 years (after exclusions)
Control group	4th January–5th April 2013, 4th January–5th April 2014 (excluding trialled interventions)	187,554	145,427	31,959
Greater London interventions
(A) CRUK endorsement flyer only	27th January–4th February 2014	10,286	8,093	1,609
(B) CRUK endorsement flyer, plus kit enhancement pack	5th February–11th February 2014	9,096	7,148	1,475
North East London interventions
(C) CRUK endorsement flyer, plus advertising campaign	24th February–13th March 2014	5,121	4,332	466
(D) CRUK endorsement flyer, plus kit enhancement pack and advertising campaign	24th March–14th April 2014	5,297	3,980	1,052
Total	—	217,354	168,980	36,561