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—In the article entitled "Difficulties in Estimating Glomerular Filtration Rate in the Elderly," published in the August 1987 Archives (1987;147:1430-1433), an error appeared on page 1430, column 2, lines 8 and 9. The words "if female" were omitted from line 8. The formula should have read as follows: "Creatinine clearance (mL/min) = [(140—age, y)(weight, kg)(0.85 if female)]/[(72)(serum creatinine level, mg/dL)]."