Diameter of the Infrarenal Aorta as a Risk Factor for Abdominal Aortic Aneurysm: The Tromsø Study, 1994–2001

AbstractObjectivesWe aim to study whether the diameter of the non-aneurysmatic infrarenal aorta influences the risk for abdominal aortic aneurysm (AAA) and whether the larger diameter in men can explain the male predominance in AAA.DesignThis is a population-based follow-up study.Materials and methodsIn 4265 men and women with a normal-sized aorta in 1994-1995, 116 incident cases of AAA were diagnosed 7 years later. The risk of an incident AAA was analysed in a multiple logistic regression model according to baseline maximal infrarenal aortic diameter, adjusted for known risk factors.ResultsCompared with subjects with aortic diameter in the 21-23 mm bracket, men and women with a diameter