Table 4.

Risk factors for AAA identified in a population-based screening study^*

Factor	Sensitivity (%)	Specificity (%)	Likelihood ratio for positive	Likelihood ratio for negative
Male sex	81	59	1.98	0.32
Age 55–65 years	22	43	0.39	1.81
Age 66–75 years	38	62	1.00	1.00
Age >75 years	39	81	2.05	0.75
Current smoking	38	79	1.81	0.78
Antihypertensive drug use	36	70	1.20	0.91
Angina pectoris	11	94	1.83	0.95
Intermittent claudication	5	99	5.00	0.96
History of myocardial infarction	17	94	2.83	0.88
Cholesterol ≥6.5 mmol/L	57	46	1.06	0.93
Ankle-arm index ≤0.9	29	89	2.64	0.80
Enlarged aorta on palpation	19	97	6.33	0.84
Bruit over abdominal aorta	14	96	3.50	0.90

*AAA was defined as an aortic diameter >3.5 cm. Columns 1 to 3 from Table 2, reference 46; used with permission. Likelihood ratios determined based on study data.

AAA indicates abdominal aortic aneurysm.