Colorectal and interval cancers of the Colorectal Cancer Screening Program in the Basque Country (Spain)

Table 2 f-Hb values of previous negative screening test in interval cancer cases

	Median f-Hb (μg Hb/g faeces)	IQR	P value
All	2.8	0.4-9.9	-
Sex
Male	3.4	0.2-10.0	0.409
Female	1.9	0.4-9.8
Age (yr)			0.380
50-54	1.9	0.2-6.9
55-59	3.0	0.6-13.0
60-64	2.8	0.2-8.6
65-69	4.0	0.4-12.5
Deprivation Index			0.887
1 (least deprived)	3.0	0.6-11.9
2	2.6	0.0-10.2
3	4.2	1.1-12.4
4	4.0	0.4-11.2
5 (most deprived)	2.6	0.0-8.7
Time to diagnosis (mo)			0.795
Within 1 yr	3.4	0.2-10.6
1-2 yr	2.5	0.5-9.6
Location			0.171
Proximal1	1.9	0.0-9.3
Distal2	3.8	0.3-13.7
Rectum	3.9	0.7-9.1
Unknown	1.0	0.0-…
Stage			0.927
I	2.0	0.0-9.7
II	2.6	0.2-10.6
III	3.2	0.7-9.8
IV	4.0	0.2-9.9
Unknown
Morphology			0.550
ADC, NOS	3.0	0.6-10.0
ADC in adenomatous polyp	10.0	2.0-17.2
ADC in villous adenoma	0.5	0.0-9.8
ADC in tubulovillous adenoma	2.4	0.0-9.3
Mucinous ADC	0.4	0.0-12.5
Mucin-producing ADC	14.0	0.0-…
Other	1.7	0.0-6.0
Unknown	1.0	0.0-6.9
Degree of differentiation			0.600
Well differentiated	2.8	1.0-9.0
Moderately differentiated	4.4	0.6-13.0
Poorly differentiated	0.6	0.0-5.6
Undifferentiated/anaplastic	4.0	0.0-9.4
Unknown	2.0	0.0-…
Size (mm)
< 10	1.4	0.4-12.4	0.586
10-19.99	1.0	0.0-7.9
≥ 20	2.9

¹Caecum, ascending, hepatic flexure, transverse;

²Splenic flexure, descending. ADC: Adenocarcinoma; IQR: Interquartile range.