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Figure 1 Prevalence of renal artery stenosis (RAS) by age. Renal artery stenosis was infrequent in patients under age 60 years, despite the requirement that all patients meet predefined selection criteria for renal angiography. Severe RAS was present in 0 of 37 patients age <40 years, 1 (1.3%) of 75 patients age 40 to 49 years, 5 (2.4%) of 210 age 50 to 59 years, 22 (7.7%) of 287 age 60 to 69 years, 35 (15.8%) of 221 age 70 to 79 years, and 20 (7.0%) of 142 age 80 years or older. Age remained independently associated with RAS after adjustment for other patient characteristics. Degrees of RAS stenosis: >70% (solid black bars); 50% to <70% (bars with thick diagonal lines); and normal or <50% (bars with thin diagonal lines).