See related article, pp 397-405 W omen live longer than men. The longer life expectancy of women is commonly attributed to their lower cardiovascular risk profile and to the fact that they develop cardiovascular complications at a lower rate and a later age than men. A number of population studies have indeed shown that, at comparable age, women are characterized by a lower incidence of angina pectoris, myocardial infarction, and stroke than men. 1 This has contributed to the general medical belief that women are at low cardiovascular risk at least until they reach the menopause. One of the issues with this concept is this: do we potentially underestimate the real cardiovascular risk of women and thereby miss an opportunity to improve our ability to prevent cardiovascular complications in women?In this issue of Hypertension, Boggia et al 2 report the results of a comparison of the cardiovascular risk associated with office and ambulatory systolic blood pressure (BP) measurements in a large cohort of women and men from the general population of 11 different countries. As reported previously, women were at lower risk of cardiovascular events than men in this international cohort followed up for a median of 11.2 years. However, when assessing the association of cardiovascular complications with 24-hour ambulatory BP and nighttime BP, the authors found that the relation of all cardiovascular events and stroke and cardiac events with nighttime BP were much steeper in women. Thus, the percentage of preventable cardiovascular events in relation to nighttime systolic BP but not daytime systolic BP was significantly greater in women than in men. These results therefore suggest that although women are at low cardiovascular risk, there is a clear potential for improvement in the assessment of their cardiovascular risk by using ambulatory BP rather than office BP and by analyzing more carefully the nighttime BP.The data presented by Boggia et al 2 are interesting in several respects. First, one has to acknowledge the fact that the authors were able to follow up a large cohort of subjects for more than a decade and to collect data from subjects recruited from 11 countries from Europe, Asia, Russia, and South America by using a standardized protocol that included ambulatory BP monitoring (ABPM). Although this may complicate the statistical analysis, it also enables one to generalize the results to different populations. One must also emphasize that this is the first analysis specifically addressing the specific sex differences in the association between outcome and ambulatory BP. Interestingly, although the study confirms the lower incidence of total, cardiovascular, and noncardiovascular mortality and of cardiovascular morbidity in women and the better cardiovascular risk profile of women, they do not appear to be underdiagnosed or undertreated for hypertension. Indeed, the percentage of untreated persons in this cohort was lower among women than men, and the number of treated and adequately controlled cases was slightly bet...