Table 2a.

Adherence for Assigned Screening-Colonoscopy and HSgFOBT Arm Subjects and by Round of Screening

Center	Screening-Colonoscopy Adherence (adherent/total)	HSgFOBT Adherence by Annual Year and Round
		Annual Round 1	Annual Round 2	Annual Round 3	Annual Round 4	Annual Round 5	Annual Round 6	Annual Round 7	Odds Ratio* (95% CI)
UMN	915/1024 (89.4%)	798/1024 (77.9%)	600/840 (71.4%)	490/682 (71.8%)	416/595 (69.9%)	283/423 (66.9%)	140/217 (64.5%)	57/90 (63.3%)	0.89 (0.85, 0.92)
KPWA	181/233 (77.7%)	180/235 (76.6%)	151/214 (70.6%)	146/200 (73.0%)	136/180 (75.6%)	52/83 (62.7%)	34/52 (65.4%)	8/15 (53.3%)	0.93 (0.86,1.01)
LSUHS ***	377/504 (74.8%)	310/503 (61.6%)	229/438 (52.3%)	196/410 (47.8%)	154/381 (40.4%)	117/295 (39.7%)	54/116 (46.6%)	11/27 (40.7%)	0.80 (0.76, 0.85)
Total	1473/1761 (83.6%) **	1288/1762 (73.1%) **	980/1492 (65.7%)	832/1292 (64.4%)	706/1156 (61.1%)	452/801 (56.4%)	228/385 (59.2%)	76/132 (57.6%)	0.86 (0.83, 0.88)

High sensitivity fecal occult blood test (HSgFOBT), 95% Confidence Intervals (95% CI)

^*Odds ratio defined over the 7-year study period from general estimating equations analysis adjusted for study entry year, age, sex, and center

^**The relative risk (RR) of screening-colonoscopy vs. HSgFOBT adherence in the first round was 1.18 (95% CI 1.14 −1.22)

^***Adherence for screening-colonoscopy at LSUHS was 83% for whites and 78% for Blacks (RR = 0.94, 95% CI: 0.86 – 1.02)³⁴