What is the difference in the HR between the 65 to 69 year age group and the 70 to 74 year age group?
The HR comparing CAS to CEA was 1.61 (95% CI, 0.90 2.88) in the group 65 to 69 years of age, whereas the HR comparing CAS to CEA was 2.09 (95% CI, 1.32 3.32) in the group 70 to 74 years of age.