Table 2.

Frequencies (proportions) of participants with undetectable f-Hb, and frequencies (proportions), geometric means and 80% empirical ranges for participants with detectable and positive f-Hb (µg/g), stratified by demographic characteristics and screening episodes.

	Undetectable f-Hba (<4 µg/g)		Detectable f-Hba (≥4 µg/g)				Positive f-Hb (≥20 µg/g)
	N	%	N	%	Meanb	80% PRc	N	%	Meanb	80% PRc
Hub
Southern	11,965	81.2	2778	18.8	19	5–126	1049	7.1	78	24–405
Midlands and North West	9468	75.8	3027	24.2	18	5–113	1084	8.7	78	25–389
Sex
Female	11,553	80.2	2851	19.8	16	5–90	947	6.6	69	24–300
Male	9880	77.0	2954	23.0	21	5–153	1186	9.2	86	25–481
Age group, years
59–64	9012	80.8	2142	19.2	18	5–120	771	6.9	78	25–389
65–69	7619	78.7	2066	21.3	18	5–120	747	7.7	80	25–383
70–75	4802	75.0	1597	25.0	19	5–113	615	9.6	76	24–401
IMD quintiled
IMD 1 (most deprived)	2199	72.9	817	27.1	20	5–123	324	10.7	75	24–359
IMD 2	3087	75.6	994	24.4	20	5–122	392	9.6	78	25–432
IMD 3	4657	79.2	1226	20.8	18	5–117	435	7.4	80	25–394
IMD 4	5314	79.5	1372	20.5	18	5–118	504	7.5	79	25–405
IMD 5 (least deprived)	6172	81.6	1396	18.4	17	5–111	478	6.3	78	24–416
IMD n/ke	4	.	0	.	.	.	0	.	.	.
Screening episode (n, %)
Previous responders	16,109	78.7	4356	21.3	18	5–111	1592	7.8	75	24–367
First-time invitees	3234	81.6	728	18.4	17	5–112	248	6.3	82	25–522
Previous non-responders	2090	74.4	721	25.6	22	5–175	293	10.4	91	25–450
Overall	21,433	78.7	5805	21.3	18	5–118	2,133	8	78	25–394

^af-Hb, faecal haemoglobin concentration (µg/g).

^bGeometric mean. ^c80% percentile range (PR) is the 10th and the 90th percentile observed.

^dIMD, index of multiple deprivation. IMD 1 to IMD 5 is the scale from the most deprived to the least deprived.

^eParticipants whose postcode could not be linked to lower layer super output areas (LSOA).