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. Author manuscript; available in PMC: 2019 Mar 1.
Published in final edited form as: Atherosclerosis. 2018 Feb 4;270:110–116. doi: 10.1016/j.atherosclerosis.2018.01.044

Table 4.

Risk of clinical abdominal aortic aneurysm in relation to quartiles of Beta Index of the carotid artery, ARIC, 1990–2011

Beta Indexa Quartile 1 Quartile 2 Quartile 3 Quartile 4 p for trend
Quartile range 2.83 – 8.17 8.18 – 10.28 10.29 – 13.05 13.06 – 44.49
N at risk 2572 2573 2573 2572
No. events 50 89 102 111
Incidence rateb 1.05 (0.79, 1.38) 1.91 (1.55, 2.35) 2.25 (1.85, 2.73) 2.55 (2.12, 3.07)
HR (95% CI)
Model 1c 1 1.58 (1.11, 2.24) 1.68 (1.19, 2.38) 1.72 (1.21, 2.44) 0.003
Model 2d 1 1.61 (1.12, 2.31) 1.62 (1.12, 2.33) 1.68 (1.16, 2.43) 0.006

CI: confidence interval; HR: hazard ratio;

a

Higher level of the Beta Index indicates less carotid artery distensibility;

b

Crude incidence rate per 1000 person-years;

c

Model 1: Adjusted for age, sex, race, and ARIC center;

d

Model 2: Adjusted for age, sex, race, ARIC center, height, smoking status, pack-years of smoking, total cholesterol, high-density lipoprotein cholesterol, use of lipid medications, systolic blood pressure, use of antihypertensive medications, and diabetes at ARIC Visit 2.