Table 1

Outcome measures and related factors

Outcome measures	Uptake rate of screening
	Uptake rate of colonoscopy
	Positivity of the screening test
	Detection rate of neoplasia (adenomas or bowel cancers)
	Detection rate of bowel cancer
	Sensitivity
	Positive predictive value (PPV) for neoplasia
	PPV for bowel cancer
Factors	Age, gender, social deprivation, ethnicity and screening history
	For analysis of the second and third rounds, the categories of screening history were defined by participation in previous rounds:
	invitation, to previous non-responder invitation at <2.5 years interval after previous screen invitation at ≥2.5 years interval after previous screen (third round only): responded in first round but not in second round