After a median of 10.9 years , 71 participants died of colorectal cancer in the screening group vs 330 in the control group ( 31.4 vs 43.1 deaths per 100,000 person-years ; absolute rate difference , 11.7 [ 95 % CI , 3.0-20 .4 ] ; hazard ratio [ HR ] , 0.73 [ 95 % CI , 0.56-0 .94 ] ) .