Table 1 Demographics of screenees undergoing CTC and optical colonoscopy (OC). Deprivation quartiles are derived from the entire English national dataset. Between group comparative p values are for all CTC screenees vs. all colonoscopy screenees (far right) and for the CTC subgroups (middle column)
Variable | Test performed | p value (CTC vs. OC) | ||||
|---|---|---|---|---|---|---|
CTC (n = 1970) | OC (n = 50,975) | |||||
Unsuitable for OC (n = 1191) | Incomplete OC (n = 779) | Both groups (n = 1970) | p value (between CTC subgroups) | |||
Female patients | 552 (46.3 %) | 465 (59.7 %) | 1017 (51.6 %) | <0.001 | 21,111 (41.4 %) | <0.001 |
Age in years (median, IQR) | 66 (63 to 70) | 66 (63 to 69) | 66 (63 to 69) | 0.08 | 66 (63 to 69) | <0.001 |
Deprivation score | ||||||
Lowest quartile (least deprived) | 265 (22.2 %) | 200 (25.7 %) | 465 (23.6 %) | 0.09 | 15,000 (29.4 %) | <0.001 |
2nd quartile | 334 (28.0 %) | 213 (27.3 %) | 547 (27.8 %) | 0.77 | 14,569 (28.6 %) | 0.45 |
3rd quartile | 305 (25.6 %) | 215 (27.6 %) | 520 (26.4 %) | 0.35 | 12,388 (24.3 %) | 0.036 |
Highest quartile (most deprived) | 283 (23.8 %) | 151 (19.4 %) | 434 (22.0 %) | 0.03 | 8925 (17.5 %) | <0.001 |
Missing | 4 (0.34 %) | 0 (0.0 %) | 4 (0.20 %) | 0.16 | 93 (0.18 %) | 0.78 |
Year screened | ||||||
2011 | 691 (58.0 %) | 482 (61.9 %) | 1173 (59.5 %) | - | 29595 (58.1 %) | - |
2012 | 500 (42.0 %) | 297 (38.1 %) | 797 (40.5 %) | 0.10 | 21380 (41.9 %) | 0.20 |
Screening round | ||||||
Prevalent (individual’s first screening) | 527 (44.2 %) | 358 (46.0 %) | 885 (44.9 %) | - | 22159 (43.5 %) | - |
Incident (subsequent screening of that individual) | 664 (55.8 %) | 421 (554.0 %) | 1085 (55.1 %) | 0.48 | 28816 (56.5 %) | 0.21 |