In the article entitled "Sex Differences in Brain Aging: A Quantitative Magnetic Resonance Imaging Study," published in the February issue of the ARCHIVES (1998;55:169-179), the coefficient for increased age associated with increased volumes of the lateral ventricles was incorrectly stated on page 172 in the paragraph subtitled "Age Main Effects," last sentence. The sentence should have read as follows: "Increased age was also associated with increased volumes of the lateral ventricles (coefficient=0.88, P<.001) and the third ventricle (coefficient=0.05, P<.001)."